IPA: /rɪˈɡeɪn/
KK: /rɪˈɡeɪn/
To get something back that was lost or taken away.
After months of training, she was able to regain her strength.
Past: regained
Past Participle: regained
Regain → It is formed from "re-" (meaning again) and "gain" (from Old French *gaigner*, meaning to win or acquire). The word "regain" means to win or acquire something again after losing it.
Think of 'gaining' something 'again' — 're-' means again, and 'gain' means to win or acquire.