B2slight problems or effort: I didn't mean to cause you any trouble."I'd love some more tea, if it isn't too much trouble." "Oh, it's no trouble at all."I don't want to put you to any trouble (= create any work for you).[+ to infinitive]If you took the trouble to listen to what I was saying, you'd know what I was talking about.They went to a lot of trouble (= made a lot of effort)for their dinner party, but half the guests didn't bother to turn up.It's annoying, but I don't think I'll go to the trouble of making an official complaint.Inconvenience