Plural of glime; archaic or dialectal term for squints, glimpses, or a sidelong look.
From glime (Middle English, possibly related to glance or glimpse), + -s (plural). Rare in modern English, preserved mainly in regional dialects.
The word 'glime' is so old and rare that etymologists aren't completely sure where it came from—it's like finding a word fossil that points to an ancestor we can't quite trace.
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