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1. To physically grip something. Hold onto the railing so that you don't lose your balance.
2. To wait. Often used as an imperative. Hey, hold on—that's not what I'm saying at all.
3. To continue despite challenges. The company will not be able to hold on if we lose money again this quarter.
Hold on (a minute)!and Hold on for a minute!
Stop right there!; Wait a minute! (Minute can be replaced by moment, second, or other time periods.) Bob: Hold on, Tom. Tom: What? Bob: I want to talk to you. "Hold on!" hollered Tom. "You're running off with my shopping cart!"
See also: hold