What does "beef up" mean?

To strengthen or reinforce; to add substance to.

What is a synonym for "beef up"?

Common synonyms include: accelerate, aggrandize, aggravate, aught, augment, blow up.

verb, slang

verb, slang ·Moderate ·High school level

Verb

1
To strengthen or reinforce; to add substance to. slang, transitive
"We need to beef up security around the airport."
2
make strong or stronger wordnet

"We need to beef up security around the airport."

Originally college slang, from beef (“muscle-power”).