roosern.
/ˈruːzə/, U.S. /ˈruzər/, Scottish English /ˈruzər/ Scottish. Now rare.
A boaster, braggart.Chiefly recorded in the proverb a good (also great) rooser was never a good rider.
ΘΚΠ
the mind > emotion > pride > boasting or boastfulness > [noun] > boaster
yelper1340
avaunterc1374
braggerc1390
fare-makerc1440
seggerc1440
shakerc1440
vaunter1484
roosera1500
praterc1500
cracker1509
vouster?a1513
boaster1574
Thrasoa1576
braggarta1577
braver1589
glorioser1589
bragout1592
rodomont1592
braggadocio1594
gloriosoc1599
puckfist1600
burgullian1601
puff1601
forthputtera1610
rodomontado1609
ostentator1611
fanfaron1622
potgun1623
thrasonist1626
cracka1640
vapourer1653
braggadocian1654
rodomontadist1655
charlatan1670
brag1671
rodomontade1683
gasconader1709
rodomontader1730
Gascon1757
spread eagle1809
bag of wind1816
penny trumpeter1828
spraga1838
gasser1855
blow-hard1857
blower1863
crower1864
gabber1869
flannel-mouth1882
punk-fist1890
skiter1898
Tartarin1903
blow1904
skite1906
poofter1916
trombenik1922
shooter of lines1941
fat-mouth1942
wide-mouth1959
Wheneye1982
trash talker1986
braggarist-
a1500 Consail & Teiching Vys Man (Cambr. Kk.1.5) in R. Girvan Ratis Raving & Other Early Scots Poems (1939) 72 Thow knawis thi-self thocht men the Russ Far bettir than the rusare dois.
1535 W. Stewart tr. H. Boethius Bk. Cron. Scotl. (1858) III. 440 [It] hapnis oft ane vanter to be liear,..And ane gude rusar [is] seindill ane gude rydar.
1668 R. B. Adagia Scotica 3 A good ruser was never a good rider.
1721 J. Kelly Compl. Coll. Scotish Prov. 36 A great ruser was never a good rider.
1868 A. Hislop Prov. Scotl. (rev. ed.) 23 A great rooser was ne'er a gude rider.
1911 A. Warrack Scots Dial. Dict. 463/1 Rooser, boaster, one given to self-commendation.
This entry has been updated (OED Third Edition, November 2010; most recently modified version published online March 2022).
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n.a1500