See: HOLD ONE'S END UP.
{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./