I .
/ gɪl; NAmE / noun
[ usually pl. ] one of the openings on the side of a fish's head that it breathes through
—picture at fish
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IDIOMS
- to the gills
II .
/ dʒɪl; NAmE / noun
a unit for measuring liquids. There are four gills in a pint.
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WORD ORIGIN
I . Middle English : from Old Norse .
II . Middle English : from Old French gille measure or container for wine, from late Latin gillo water pot.