●ˌfirm sth ˈup ( ˌfirm ˈupless frequent) 1.if sb firms up an arrangement, an agreement, etc. it becomes more definite or less likely to change落实，敲定（安排、协议等）◆I’ll phone on the 25th to firm up the details of the meeting. 我 25 号会打电话确认会议细节。◆Prices will firm up later this year. 今年晚些时候会确定价格。OBJplans, agreement2.to make sth, especially part of the body harder, or more solid使（尤指身体部位）坚实；使坚硬；使牢固◆These exercises will firm up those difficult areas of your body. 这些运动会使有问题的身体部位变结实。[v + adv + n][v + pron + adv][v + n + adv] (rare) [v + adv]