v.
Pronunciation: di- ' r ā l, d ē -
Function: verb
Etymology: French dérailler to throw off the track, from dé- de- + rail, from E
Date: 1850
transitive verb
1 : to cause to run off the rails
2 a : to obstruct the progress of : FRUSTRATE <security problems derail ed the tour> b : to upset the stability or composure of <divorce ⋯ can seriously derail an employee ― Joanne Gordon>
intransitive verb : to leave the rails
– de · rail · ment \ -m ə nt \ noun