what is the meaning of gills?

[Jerrak]

English Language Tests, Intermediate level

ESL/EFL Test #303 "English Slang Idioms (25)", question 3

"When we went out on patrol in Vietnam, we were always armed to the .........," Hector reminisced.

(a) gills
(b) tank
(c) teeth
(d) mind

English Language Tests, Intermediate level

ESL/EFL Test #303 "English Slang Idioms (25)", answer 3

"When we went out on patrol in Vietnam, we were always armed to the teeth," Hector reminisced.

Correct answer: (c) teeth
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what is the meaning of gills?

Jerrak

[Mister Micawber]

.
The flaps on the sides of a fish's head-- part of its breathing apparatus.
.
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Native English teacher at Mister Micawber's