regain one's strength

bounce back gain grow heal increase overcome pick up rebound recuperate restore revive

better convalesce mend rally refresh rejuvenate renew

be out of woods come around feel oneself again forge ahead get back on feet get better get in shape get out from under get over get well make a comeback perk up pull through regain one's health return to form snap back sober up start anew take turn for better

decline decrease destroy diminish hurt lose spend worsen

deteriorate kill ruin weaken

mislay miss wane