warrant
verb uk/ˈwɒr.ənt/ us/ˈwɔːr.ənt/
(MAKE NECESSARY)
[ T ]使有必要
to make a particular activity necessary
Obviously what she did was wrong, but I don't think it warranted such a severe punishment. 显然她做得不对，但我认为她不应该受到如此严厉的惩罚。
It's a relatively simple task that really doesn't warrant a great deal of time being spent on it. 这是一个相对来说比较简单的任务，不必在上面花费大量的时间。
See also: unwarranted
(CERTAIN)
[ I or T ] old-fashioned担保，保证;许诺
used to say that you are certain about something
He's to blame, I'll warrant (you). 是他的错，我（跟你）保证。
warrant
noun uk/ˈwɒr.ənt/ us/ˈwɔːr.ənt/
(DOCUMENT)
[ C ]（由法官或官员签署的）搜查令，逮捕状，令状
an official document, signed by a judge or other person in authority, that gives the police permission to search someone's home, arrest a person, or take some other action
a search warrant 搜查令
Judge La Riva had issued an arrest warrant/a warrant for his arrest. 拉里瓦法官已经签署了一份逮捕状／逮捕他的令状。
(REASON)
[ U ] UK old-fashioned做事情的理由
a reason for doing something
There's no warrant for that sort of behaviour! 那种行为毫无任何根据！