a heads up

To give someone a warning of iminent danger, trouble or strife.

Dude - Jonny's banging Daves wife! I best call him and give him a heads up!

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heads up

Advance notice of something that will need attention.

Just a heads up that the customer is likely to escalate this problem...

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heads-up

1. advance notice

2. a warning

Just wanted to give you a heads up so you'll be expecting his call.

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head up

To fight someone 1 on 1 with no one else getting involved

Yo you got beef? Lets head up

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heads up

Exclamatory warning indicating that one practice increased alertness to avoid harm from a pressing threat.

Dorm Resident #1: Is that an M-80 in the toilet?

Dorm Resident #2: Heads up!!!!

*BOOOM!!*

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heads-up

a warning, especially of danger or the need to be alert

Heads-up. There's a situation out there.

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Heads up

Only two players in a poker hand, typically Texas Hold 'em

That heads up round was intense

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