[kǒu lìng]
（口头命令） word of command; word; command; shibboleth
We await your command.
我们等待你的口令。
challenge and reply
口令问答
You must give the word before you can pass.
你必须说出口令才能通行。
He did not know the watchword.
他不知道口令。
We gave the watchword, and the sentinel let us pass.
我们说出口令， 哨兵就把我们放过去了。