A scarecrow or a grotesque figure used to frighten birds or people, or a tall, thin, awkward-looking person.
From 'gally' (to scare) plus 'crow' (the bird); originally referred to scarecrows, then extended to describe oddly-shaped people.
The word 'gallycrow' shows how old rural terms for scarecrows connected the action (scaring) directly to what was being scared (crows)—it's literal poetry compared to the plain word 'scarecrow.'
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