beef up in American English
to strengthen by addition, reinforcement, etc.
What does it mean to be beefed up?
informal. : to add weight, strength, or power to (something) Security around the city will be beefed up during the event. a politician looking to beef his image up.
What does the word beefed mean?
verb. beefed; beefing; beefs. Definition of beef (Entry 2 of 2) transitive verb. : to increase or add substance, strength, or power to —usually used with up money to beef up its staff of professional economists— John Fischer.