In falconry, to bind or hobble a hawk's wings, or more broadly, to confine or restrain something.
From Old French 'brailler' meaning to cry out or shake, possibly related to 'bray.' In falconry, it specifically developed to mean securing a bird's wings.
Brail is a technical falconry term that barely anyone uses anymore, but it shows how specialized hobbies develop their own vocabularies—medieval falconers created an entire dictionary for controlling hawks.
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