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English definition of “through”

through

adjective     /θruː/
be through with sth informal to have finished using something or doing something: Let me know when you're through with the iron .Stop having or doing something
be through (with sb) informal to not have a relationship with someone any moreEnding relationships and divorce
[always before noun] A through train goes all the way from one place to another place without the passenger having to change trains .Trains and parts of trains
(Definition of through adjective from the Cambridge Learner's Dictionary © Cambridge University Press)

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