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Phrase(s): keep one’s end up
1. Lit. to hold one’s end of a load so that the load is level. • Be sure to keep your end up while we go up the stairs. • Try to keep up your end. 2. Fig. to carry through on one’s part of a bargain. • You have to keep your end up like the rest of us. • Don’t worry, I’ll keep up my end.
McGrawhill's American Idioms And Phrasal Verbs