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useful

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make (oneself) useful

To do something that is actively helpful or of assistance to others. You know, instead of just sitting there watching TV, you could make yourself useful and take out the garbage. Towards the end of the party, I decided to make myself useful and wash the dishes.

See also: make, useful

come in useful

to be useful. Your report has come in useful a number of times.

See also: come, useful