Plural of bobfly; a fishing fly with a bobbing or jerking motion used in fly fishing to mimic insect movements.
From 'bob' (to move up and down) + 'flies' (plural of fly); a term from fishing terminology describing artificial lures designed to move with a distinctive bobbing action.
Fly fishermen discovered that making their artificial lures bob and jerk instead of drift naturally imitates panicked insects trying to escape—it's basically visual psychology for trout.
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