rail
noun /reɪl/
  /reɪl/
Idioms - [countable] a wooden or metal bar placed around something as a barrier or to provide support
- She leaned on the ship's rail and gazed out to sea.
 
Extra Examples- She climbed onto the top fence rail.
 - She held tightly on to the rail.
 - After the accident a guard rail was placed all the way along the cliff path.
 - She came slowly down the stairs, holding the banister rail.
 
Oxford Collocations Dictionaryadjective- guard
 - safety
 - curtain
 - …
 
- grab
 - grasp
 - grip
 - …
 
- on a/the rail
 - over a/the rail
 
 - [countable] a bar fixed to the wall for hanging things on
- a picture/curtain/towel rail
 
Extra Examples- There was thick dust on the picture rail.
 - Lace curtains hung from the brass rails over the bed.
 - heated towel rails
 
Oxford Collocations Dictionaryadjective- guard
 - safety
 - curtain
 - …
 
- grab
 - grasp
 - grip
 - …
 
- on a/the rail
 - over a/the rail
 
 
enlarge image[countable, usually plural] each of the two metal bars that form the track that trains run onExtra ExamplesTopics Transport by bus and trainb2- The train thundered along the rails.
 - The train came off the rails.
 - Trams run along rails.
 - Weeds grew between the rails.
 - A child was seen crossing the rails.
 - The gun is mounted on rails.
 
Oxford Collocations Dictionaryverb + rail- run along rails
 - run on rails
 
- along (the) rails
 - between the rails
 - on (the) rails
 - …
 
- come off the rails
 - go off the rails
 - ride the rails
 - …
 
- [uncountable] (often before another noun) railways as a means of transport
- by rail to travel by rail
 - rail travel/services/fares
 - a rail link/network
 
Extra ExamplesTopics Transport by bus and trainb2- He uses a combination of commuter rail and subway to get to work.
 - Many business people now opt for high-speed rail rather than flying.
 - We went from London to Budapest by rail.
 - the Channel Tunnel rail link
 - efforts to modernize the rail network
 
Oxford Collocations Dictionaryadjective- high-speed
 - light
 - commuter
 - …
 
- fare
 - ticket
 - network
 - …
 
- by rail
 
 
Word Originnoun Middle English: from Old French reille ‘iron rod’, from Latin regula ‘straight stick, rule’.
Idioms 
get back on the rails 
- (informal) to become successful again after a period of failure, or to begin functioning normally again
- He has helped get the company back on the rails again.
 
 
go off the rails (informal)
- to start behaving in a way that is strange or unacceptable, for example drinking a lot or taking drugs
- She went completely off the rails after her sister died.
 - She was worried her son was going to go completely off the rails.
 
 - to lose control and stop functioning correctly
- The company has gone badly off the rails in recent years.
 
 
jump the rails 
- (of a train) to leave the track suddenly
 
