code name

1. N-COUNT A code name is a name used for someone or something in order to keep their identity secret. 化名[usu N n]

One of their informers was working under the code name Czerny. 他們的一名線人的化名爲車爾尼。

2. V-T If a military or police operation is code-named something, it is given a name which only the people involved in it know. 代號爲[usu passive]

The operation was code-named Moonlight Sonata. 這次行動的代號是“月光奏鳴曲”。

...a military contingent, code-named Sparrowhawk. ...代號爲“雀鷹”的小分隊。