/ki?p/kept|keptB1to make somethingcontinueatitspresentleveland notallowit tofall使不下降；使保持在高水平You musteattokeepyourstrengthup.你必须吃东西以保持体力。
keep(sth)up
—phrasal verbwithkeepverbuk
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/ki?p/us
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/ki?p/kept|keptB1tocontinuewithoutstoppingorchanging, or tocontinuesomething withoutallowingit tostoporchange（使）继续下去，（使）不停止；（使）不改变Keep up the goodwork!继续好好干！#https://dictionary.cambridge.org//dictionary/english-chinese-simplified/keep-sth-up##
