大嚼缰
大勒缰

Gag \Gag\, n.
1. Something thrust into the mouth or throat to hinder
speaking.

2. A mouthful that makes one retch; a choking bit; as, a gag
of mutton fat. --Lamb.

3. A speech or phrase interpolated offhand by an actor on the
stage in his part as written, usually consisting of some
seasonable or local allusion. [Slang]

4. a remark or act causing laughter.

5.. A prank.

{Gag rein} (Harness), a rein for drawing the bit upward in
the horse's mouth.

{Gag runner} (Harness), a loop on the throat latch guiding
the gag rein.