The Collaborative International Dictionary
gill over the ground
Gill \Gill\, n. [Abbrev. from Gillian.]
A young woman; a sweetheart; a flirting or wanton girl. ``Each Jack with his Gill.''
--B. Jonson.(Bot.) The ground ivy ( Nepeta Glechoma); -- called also gill over the ground, and other like names.
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Malt liquor medicated with ground ivy. Gill ale.
Ale flavored with ground ivy.
(Bot.) Alehoof.