to eat; to chew and swallow; to dine at (a restaurant etc.); also includes consuming liquids such as drinking tea or soup

Used between a verb and its result to show that the action cannot achieve that result; used as the negative form of the 得 de potential construction

to get used to; to adapt to a new environment, as in the phrase 水土不服 shuǐ​tǔ​bù​fú