This is the 11380th most frequent French word.
regain
Regain (French): Aftermath; second growth of grass or hay.
Here, 'regain' is a noun indicating a sudden increase or resurgence of interest.
Ils ont constaté un regain d'intérêt pour la musique classique.
They noticed a renewed interest in classical music.
Here, 'regain' is used as a noun meaning 'recovery' or 'resurgence' of strength.
Après son accident, elle fait des efforts pour retrouver un regain de force.
After her accident, she makes efforts to regain some strength.
In this case, 'regain' is used as a verb meaning to recover or restore confidence.