Expressions (phrases, clauses, etc.), Godan verb with 'ku' ending
to master (e.g. a skill); to become accustomed to (e.g. a lifestyle); to acquire (e.g. a habit)
毎日一生懸命に英語を勉強したが、あまり身につかなかった。I studied English very hard every day, but I didn't learn a lot. to retain
see 悪銭身に付かず
Also written 身に付く【みにつく】