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To increase something, often in strength. With all these protestors here, we definitely need to beef up security. My boyfriend has been going to the gym every day for months in hopes of beefing up his frame. We need to beef up our services in order to rival our competitors' more comprehensive offerings.
beef something up
to add strength or substance to something. Let's beef this music up with a little more on the drums. They beefed up the offer with another thousand dollars.
Strengthen, reinforce, as in Mary wants us to beef up her part in the play. This phrase relies on an older slang sense of beef as "muscles" or "power." [Colloquial; late 1800s]
1. To cause someone or something to become bigger, stronger, or bulkier: You should beef up your travel report with more descriptions of what you saw. The soup tastes good, but we could beef it up by adding some spices.
2. To become bigger, stronger, or bulkier: The actor beefed up over a couple of months so that he could play the part of a boxer.