belt up

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belt up

To anchor or fasten someone in place, as with a seatbelt in a vehicle. A pronoun or the name of the person can be used between "belt" and "up" or after "up." OK, the kids are belted up—let's hit the road! Can you please belt the baby up in her highchair?
See also: belt, up

belt someone up

to secure someone with a belt, such as a seat belt in a car. I had to belt her up because the seat belt was so complicated. We belted up the kids securely.
See also: belt, up