eat in

Short definition from Wiktionary

Verb

1. 1
   To eat a meal at home.
2. 2
   To eat a purchased meal on the premises where one bought it, rather than taking it away.
3. 3
   To etch or erode a substance. (of acid)

Adjective

1. 1
   Designed for dining in as well as food preparation.
2. 2
   Featuring seating to allow patrons to stay and eat their food on site.
3. 3
   Eaten on the premises at which it is bought.