督灰, 報寸 rat /snitch on/out

告密的意思。

1. (俗語) to rat out, rat on

e.g. The informant rats him out to the cop.
       He thought that I ratted on him.

2. (俗語) to snitch on/to

e.g. He insists that I snitched on him.
      She snitched to her boss that,...

(參考成語):
(正規用語) 洩露，透露,  爆料 disclose, divulge