Definition of "for keeps" []

With an agreement or intention to retain what one gains or receives. (adverb)
To compete seriously, with a strong resolve to win or succeed, as in sports or business. (adverb)
Permanently. (adverb)

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Use "for keeps" in a sentence

"Lars with the broken leg, and Davis laid off for keeps -- why, sir, we'll soon be that weak it'll take both watches to set a staysail."

Words like "for keeps"

for good

once and for all