变坚固；变坚实；最后落实；敲定
变坚固；变坚实
to become harder or more solid
Put the mixture somewhere cool to firm up.把混合物放在一个地方冷却变硬。
firm sth up
最后落实；敲定
to make arrangements more final and fixed
The company has not yet firmed up its plans for expansion.公司的扩大计划尚未最后落实。
使坚固；使坚硬；使坚实
to make sth harder or more solid
A few weeks of aerobics will firm up that flabby stomach.几个星期的有氧健身运动将使松弛的腹部结实。
释义来自《牛津高阶英汉双解词典》第 9 版
