heads-up

The definition of a heads up is an alert or a warning.

(noun)

An example of a heads up is when you let your Internet-surfing co-worker know that your boss is about to enter his office.

Heads up is defined as something you shout to get someone's attention.

(interjection)

An example of heads up is when you yell at a person who isn't paying attention and who is about to get hit with a frisbee.

See heads-up in Webster's New World College Dictionary

adjective

alert and resourceful: playing heads-up baseball

Origin: < interjectional phr. heads up!: see head

noun

the act or an instance of providing a notice or warning to alert someone, as in advance of difficulty or trouble

See heads-up in American Heritage Dictionary 4

interjection

Used as a warning to watch out for a potential source of danger, as at a construction site.

adjective

Showing an alert, competent style: play heads-up basketball.

noun
Informal

Information or notification, especially in advance: gave me the heads-up on the new security measures.

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