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repay sb's effort, time, attention, etc.

mainly UK

Definition

If an activity, book, etc. repays your effort, time, attention, etc., it is worth the effort or time, etc. that you spend on it: You should read this article - it would repay your time. If you think of these children growing into adults who enjoy and appreciate classical music, then that repays our effort.Useful or advantageous
(Definition of repay sb's effort, time, attention, etc. from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)