belt up
phrasal verbPart ofbelt
belt up — phrasal verb
1. to fasten the seat belt in a car, or, used as a sharp order, to stop talking and
1.phrasal verb
Definition
to fasten the seat belt in a car, or, used as a sharp order, to stop talking and be quiet.
Example
Nia reminded the children to belt up before she started the engine.
Belt up, you two — I am trying to listen to the news.