To serve up food is to put it on plates and bring it to the table. Serve up the dinner, serve up hot, ready to serve up.
The up adds nothing to the meaning except a sense of finishing, which is what these little verbs usually do. Figuratively you can serve up an excuse or a performance, and the tone is faintly dismissive.
1phraseserve upTo put the finished food onto plates and bring it to the table.
“Give me two minutes and I will serve up.”
Patternserve up + noun (dinner, a dish) · serve sth up · serve up seconds · serving
serve up is a phrase.
Also accepted in games: dish up
SERVE UP → carry it UP to the table, hot
The cooking is done: fill the plates and carry them up to the table while everything is still hot.
Practised in In the Kitchen