Recover (回復 Kaifuku) is a term that refers to the act of moving the top card of a player's deck face-down into their own Life, essentially "recovering" their Life.
This term is generally used in the Life Recovery ability. Several cards, with the majority of them being White, also use this term as part of their own ability.
Comprehensive Rules[]
1012 Recover
1012.1 If there is an instruction to "recover 1 Life", the designated player puts the topmost card of their own Deck Zone face-down into their Life.
1012.2 If there is an instruction to recover several amounts of Life, repeat the "recover 1 Life" action that specific amount of times.
1012.3 If the topmost card of the Deck Zone is moved into Life by any method without the instruction to "recover", that action is not considered as "recover".
1012.4 If there is an instruction to recover, and the player that must perform the recover is not specified, the controller of that card recover 1 Life.