暗语

shuō àn yǔ

说暗语

communicate with code word

yòng àn yǔ jiē tóu

用暗语接头

contact somebody. with code word in a rendezvous

wǒ jiě shì zhe àn yǔ tā hěn kuài jiù míng bai le

我解释着暗语，她很快就明白了。

I explained the code and she understood very quickly.

xiǎo tōu de àn yǔ

小偷的暗语

thieves'argot