sharpen one 's weapon to be ready for a fight
Sharpen with a beard, a Chinese idiom, Pinyin m ó L ì y ǐ x ū, means sharpen the knife and wait. The metaphor is to be ready and wait for the right time. It comes from Zuo Zhuan, the twelfth year of Zhaogong.
The origin of Idioms
Zuozhuan · the twelfth year of Zhaogong: if you rub your beard, the king will come out, and my blade will be cut.
Idiom usage
Our people's soldiers are ready to resist the strong enemy.
sharpen one 's weapon to be ready for a fight
please a treacherous person sextually - yíng jiān mài qiào
take precautions against a possible danger - qǔ tū yí xīn