by their might and main

• adv. 尽全力(全力以赴地)

by their might and main的用法和样例：

例句

用作副词 (adv.)

1. He gathered all his strength and swung the axe.
   他用尽全力抡起斧头。
2. They try their best to plug the new song.
   他们尽全力宣传这首新歌。