Wiktionary
have something to eat
vb. (context idiomatic English) To eat something.
Usage examples of "have something to eat".
I will have something to eat and I will assume any disguise you can supply, and I will proceed with the utmost care and caution.
About a hundred, hundred and fifty years ago somebody had the bright idea of introducing rabbits and goats to the island so if anybody got shipwrecked there they'd have something to eat.
In due course, Anne-Marie invited them to have something to eat-coupled with the caveat that she didn't know what was in the icebox and the implied suggestion that Ken should take them all out for dinner.