['hedz'ʌp]
adj.
足智多谋的

heads-up \heads-up\ adj.
maintaining presence of mind; alert and attentive; able to
recognize and take quick advantage of opportunities;
resourceful; as, he played good heads-up baseball.

Syn: wide-awake.
[WordNet 1.5]


heads-up \heads-up\ n. [From its use as an interjection to warn
of impending danger.]
a warning to be prepared for an imminent event.
[PJC]