expression, godan verb (-ku)
master a skill; become accustomed to; acquire a habit
Used when something becomes a natural part of oneself through practice or experience. Often used for skills, knowledge, habits, or lifestyles that have been internalized.
毎日練習すれば、英語が身につく。
If you practice every day, you'll master English.
新しい生活
I've finally gotten used to the new daily rhythm.
expression, godan verb (-ku)
retain; stay with one
Often used in negative or conditional expressions, such as the proverb 悪銭身につかず (easy come, easy go). Implies that something (especially money or knowledge) does not stay with a person.
See also: 悪銭身に付かず
悪銭身につかずというから、無駄遣いはやめよう。
They say easy come, easy go, so let's stop wasting money.
一夜漬けの知識は身につかない。
Crammed knowledge doesn't stick.