Etymology
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regain (v.)

1540s, "gain again, recover," as what has escaped or been lost, from French regaigner (Modern French regagner), from re- "again" (see re-) + gaginer, from Old French gaaignier "to earn, gain; trade; capture, win" (see gain (v.)). Meaning "arrive at again, return to" is from 1630s. Related: Regained; regaining.

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Definitions of regain

regain (v.)
get or find back; recover the use of;
She regained control of herself
Synonyms: recover / retrieve / find
regain (v.)
come upon after searching; find the location of something that was missed or lost;
Synonyms: find
From wordnet.princeton.edu