beef up

== English == === Etymology === Originally college slang, from beef (“muscle-power”). === Pronunciation === === Verb === beef up (third-person singular simple present beefs up, present participle beefing up, simple past and past participle beefed up) (slang, transitive) To strengthen or reinforce; to add substance to. [1941] ==== Related terms ==== ==== Translations ==== === References ===