eat out

Short definition from Wiktionary

Verb

1. 1
   To dine at a restaurant or such public place.
2. 2
   To erode or encroach upon by gradually consuming.
3. 3
   To perform cunnilingus or anilingus.
4. 4
   To reprimand severely.
5. 5
   Used other than figuratively or idiomatically: see eat, out.

Noun

1. 1
   A patch of ground where an animal has consumed all of the biomass (plants, roots, etc.).