I. gill 1 /ɡɪl/ BrE AmE noun [countable]
1 . one of the organs on the sides of a fish through which it breathes
2 . full/packed/stuffed etc to the gills informal completely full:
The bar was packed to the gills on Monday.
II. gill 2 /dʒɪl/ BrE AmE noun [countable]
a unit for measuring liquid, equal to ¼↑ pint . In Britain this is 0.14 litres, and in the US it is 0.12 litres.