Topic: HOUSEHOLD
| Date: | 1200-1300 |
| Language: | Old French |
| Origin: | reille 'bar', from Latin regula 'ruler', from regere 'to keep straight' |
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rail1 S2 W2

1 [uncountable]TTT the railway system [↪ train]:
2 [countable]TTT one of the two long metal tracks fastened to the ground that trains move along
3 [countable]DHTBB a bar that is fastened along or around something, especially to stop you from going somewhere or from falling :
Several passengers were leaning against the ship's rail. ➔ guardrail, handrail
Several passengers were leaning against the ship's rail.5 to start behaving in a strange or socially unacceptable way :
At 17 he suddenly went off the rails and started stealing.
go off the rails
informalSC
At 17 he suddenly went off the rails and started stealing.6 happening or functioning normally again :
The coach was credited with putting the team back on the rails.
back on the rails
The coach was credited with putting the team back on the rails.