blow up phr v 1 [I,T blow sth ↔ up] to destroy something, or be destroyed, by an explosion 炸毁，（使）炸得粉碎: The bridge was blown up by terrorists. 桥被恐怖分子炸毁了。 2 [T blow sth ↔ up] to fill something with air or gas 给〔某物〕充气: Come and help me blow up the balloons. 过来帮我给气球充气。