godan verb (-ku), intransitive verb
become addicted to; get hooked on; be absorbed in
Often used in the pattern 〜に病み付く to mean becoming addicted to or obsessed with something, usually in a positive or enthusiastic sense. Can also mean 'to fall ill', but this usage is less common in modern Japanese.
彼はギャンブルに病み付いてしまった。
He got addicted to gambling.
このゲームは一度始めると病
Once you start this game, you'll get hooked.