Definitions of one fell swoop Ava Richardson • Apr 07, 2026 updates Definitions from Wiktionary (one fell swoop)▸ noun: (idiomatic) One stroke; one action or event that achieves or accomplishes many results.one swell foop, scoop, swoop, sweep, stroke, swash, swipe, coup, clap, onsweep, more...in one move▸ Words similar to one fell swoop▸ Usage examples for one fell swoop▸ Idioms related to one fell swoop▸ Civic discussion about one fell swoop (New!)▸ Words that often appear near one fell swoop▸ Rhymes of one fell swoop▸ Invented words related to one fell swoop