hold one's end up
hold one's end up or hold up one's end or keep one's end up or keep up one's end {v. phr.}, {informal}
To do your share of work; do your part.
Mary washed the dishes so fast that Ann, who was drying them, couldn't keep her end up.
Susan kept up her end of the conversation, but Bill did not talk very much.
Bob said he would lend me his bicycle if I repaired the flat tire, but he didn't keep up his end of the bargain.
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Source: A Dictionary of American Idioms