sentrysen‧try /ˈsentri/ noun (plural sentries) [countable] 
Word Origin
Word OriginWORD ORIGINsentry
ExamplesOrigin:
1600-1700 Perhaps from sentry ‘sanctuary, guard-tower’ (1600-1700), from sanctuaryEXAMPLES FROM THE CORPUS
word sets- A shrill whistle is blown angrily by a shivering soldier, a sentry at the tomb.
- On the top was a pole wrapped in straw which could be ignited by the cossack sentry in case of enemy incursion.
- Or stroll up to one of the distinctive sentry boxes, aligned so defenders could harass would-be invaders with a withering cross-fire.
- Soldiers set up barbed-wire fences, electricians wired up searchlights, carpenters built barracks and sentry boxes on elevated platforms.
- Take sentries - they sit squinting into the dark, waiting to see something move, and naturally their eyes droop.
- The sentry sat hugging his rifle.
- The new sentry on the northern side was a twenty-one-year-old Berliner called Manfred.
WORD SETS► Military
Collocationsaction stations, nounaide-de-camp, nounairborne, adjectiveaircraft carrier, nounairlift, nounallied, adjectivearmour, nounarms control, nounarms race, nounarray, verbassault course, nounAWOL, adjectivebalance of power, nounbandmaster, nounbandsman, nounbase, nounbattle, nounbattle, verbbattle cry, nounbattlefield, nounbattlements, nounbeachhead, nounbivouac, nounblackout, nounblast, verbblitz, nounblockade, nounblockade, verbblockhouse, nounbloodshed, nounbody bag, nounbody count, nounbomb, verbbombard, verbbombardment, nounbomb disposal, nounboot camp, nounbowman, nounbreastplate, nounbridgehead, nounbunker, nouncall-up, nouncannonade, nouncapability, nouncaptain, nouncapture, nouncarrier, nouncashier, verbcenotaph, nounchief of staff, nouncitation, nouncivil defence, nounC.O., nouncommand, nouncommand, verbcommandant, nouncommander, nouncommander in chief, nouncommand post, nouncommissariat, nouncommissary, nouncommission, nouncommissioned officer, nounconquer, verbconquest, nounconscientious objector, nounconscript, verbconscript, nounconscription, nounconvoy, verbcookhouse, nounCorp., corporal, nouncorps, nouncounterinsurgency, nouncounterintelligence, nouncountermand, verbcounter-revolution, nouncourt-martial, nouncourt-martial, verbcross, noundawn raid, noundeath camp, noundemilitarize, verbdemobilize, verbdeploy, verbdetonate, verbdisarm, verbdisarmament, noundispatch, noundraft board, noundraft card, noundraft dodger, noundraftee, noundress uniform, noundrum major, noundump, nounechelon, nounencamp, verbenemy, nounengage, verbengagement, nounenlist, verbenlisted, adjectiveexchange, nounex-serviceman, nounex-servicewoman, nounfield, verbfirst lieutenant, nounfirst strike, nounflak jacket, nounflash, nounfort, nounfortress, nounfoxhole, nounFPO, front, noungas mask, noungeneral headquarters, nounGHQ, nounguardhouse, nounheadquarters, nounhigh command, nounHQ, nounincursion, nounindefensible, adjectiveinsignia, nouninstallation, nouninsubordination, nounintelligence, nouninternment, nouninvade, verbinvader, nouninvasion, nounkit bag, nounKP, nounlieutenant, nounline, nounMaj., major, nounmajor general, nounman, nounmarch, verbmarch, nounmarch-past, nounmarshal, nounmassacre, nounmassacre, verbmess, nounmess, verbmilitarism, nounmilitarized, adjectiveMilitary Academy, nounMilitary Cross, nounmilitary service, nounmilitia, nounmilitiaman, nounminuteman, nounmission, nounMP, nounmutineer, nounmutinous, adjectivemutiny, nounnational service, nounNATO, nounNCO, nounno-man's-land, nounnon-aggression, nounnon-aligned, adjectivenon-combatant, nounobjective, nounobservation post, nounoccupation, nounoccupy, verboffence, nounoffensive, adjectiveoffensive, nounofficer, nounoperation, nounorderly, nounoutflank, verboutpost, nounoverthrow, verboverwhelm, verbpact, nounpadre, nounparade, nounparamilitary, adjectiveparapet, nounpartisan, nounpassword, nounpatrol, nounperilous, adjectiveperiscope, nounpillbox, nounpincer movement, nounpost, verbPOW, nounpre-war, adjectiveprisoner, nounprisoner of war, nounPurple Heart, nounpush, nounputsch, nounPX, nounquarter, verbquartermaster, nounquell, verbR & R, nounraid, nounraid, verbrank, nounrebellion, nounrecapture, verbreconnaissance, nounreconnoitre, verbrecruit, verbrecruit, nounreinforce, verbrelieve, verbRemembrance Day, nounrepel, verbrequisition, verbretake, verbretire, verbretreat, verbretreat, nounreview, nounreview, verbribbon, nounsabre-rattling, nounsally, nounsalute, verbsalute, nounsalvo, nounsamurai, nounscorched earth policy, nounscout, nounscout, verbscramble, verbsecond lieutenant, nounsentinel, nounsentry, nounsentry box, nounsergeant, nounsergeant major, nounserviceman, nounservicewoman, nounSgt., shell, verbshelling, nounsiege, nounskirmish, nounstaff officer, nounstaging area, nounstandard-issue, adjectivestar, nounstation, nounstation, verbstrategic, adjectivestrategist, nounstrategy, nounstripe, nounstronghold, nounsuperpower, nounsuppress, verbsurgical strike, nounsurrender, verbsurrender, nountactical, adjectivetarget, nountarget, verbtask force, nountattoo, nountheatre, nountrench warfare, nountripwire, nountruce, nounturret, noununarmed, adjectiveunoccupied, adjectivevalour, nounveteran, nounvolunteer, nounvolunteer, verbwar chest, nounwar crime, nounwar cry, nounwar dance, nounwar effort, nounwarfare, nounwarhorse, nounwarlike, adjectivewarlord, nounwar memorial, nounwarmonger, nounwarrant officer, nounwarring, adjectivewarrior, nounwar-torn, adjectivewar widow, nounwar zone, nounwounded, adjectivezero hour, noun
COLLOCATIONS FROM THE CORPUSNOUN► box
a soldier standing outside a building as a guard· The sentry box was burning on its side from the phosphorus grenade they'd posted into it.· Or stroll up to one of the distinctive sentry boxes, aligned so defenders could harass would-be invaders with a withering cross-fire.· Yet once behind the sentry box, guilt and failure lay stacked on the barrack square.· The club entrance was dark; there was no guard in the sentry box, and the gate was open.
► duty· They even set up a neat military system of two-man sentry duties, to make sure they stayed alert.· Vechey's corpse lay in the centre of the tower near a rickety hut, formerly used by guards on sentry duty.