be slack at the beginning and have to speed up towards the end ? 他每干一項工作總是～。Whenever he tackles a job,he is slack at the beginning and has to speed up towards the end.
前松后緊
be slack at the start and have to work extra hard towards the end
前松后緊qián sōnɡ hòu jǐn
比喻開始抓得緊，到結(jié)束時放得很松。be slack at the beginning and have to speed up towards the end