Past tense of beef; to complain or to strengthen something by adding more muscle or power (as in 'beefed up').
From 'beef' as a verb, originally meaning to complain (1880s slang), later extended to mean reinforce or strengthen (1960s).
The phrase 'beefed up' became hugely popular in marketing and military language to describe making things stronger—car companies used it constantly in the 1970s, showing how slang from gym culture entered everyday business vocabulary.
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