help out
help out {v.}
1. To be helpful or useful; help sometimes or somewhat.
Mr. Smith helps out with the milking on the farm.
Tom helps out in the store after school.
2. To help (someone) especially in a time of need; aid; assist.
Jane is helping out Mother by minding the baby.
When John couldn't add the numbers, the teacher helped him out.
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Source: A Dictionary of American Idioms