病み付く

やみつく
to be taken ill
to be addicted to
to become absorbed in
to give oneself up (to)

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やみつく【病み付く】

1 〔病気になる〕 be taken ill; get [fall] ill [sick]; come down with an illness.

2 〔…が癖になる〕 ＝病み付きになる (⇒やみつき 2).