Question

What does the phrase "look sharp" mean in these lines? "Now, then!" growled Sikes, as Oliver started up; "half-past five! Look sharp, or you'll get no breakfast; for it's late as it is."

Answer 1

It basically translates to "Be at your best behavior!" or "Be ready at attention" depending on the scenario.

Answer 2

To "Look Sharp" means to look good or presentable.