headsup

heads-up

[hedz-uhp]
adjective
1.
quick to grasp a situation and take advantage of opportunities; alert; resourceful.
noun
2.
a warning in advance: sending a heads-up to the Pentagon about possible attacks.

Origin:
1945–50

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
heads-up

adjective
1. fully alert and watchful; "played heads-up ball" 

noun
1. a warning message; "he sent a heads-up to the District Attorney" 
WordNet® 3.0, © 2006 by Princeton University.
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