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The Collaborative International Dictionary
Look sharp

Sharp \Sharp\, adv.

  1. To a point or edge; piercingly; eagerly; sharply.
    --M. Arnold.

    The head [of a spear] full sharp yground.
    --Chaucer.

    You bite so sharp at reasons.
    --Shak.

  2. Precisely; exactly; as, we shall start at ten o'clock sharp. [Colloq.]

    Look sharp, attend; be alert. [Colloq.]

Wiktionary
look sharp

vb. Pay attention; be alert.

WordNet
look sharp

v. act or move at high speed; "We have to rush!"; "hurry--it's late!" [syn: rush, hasten, hurry, festinate]