To stop sleeping; to awake.
I made a speaking trumpet of my hands and commenced to whoop “Ahoy!” and “Hello!” at the top of my lungs. […] The Colonel woke up, and, after asking what in brimstone was the matter, opened his mouth and roared “Hi!” and “Hello!” like the bull of Bashan.
To awaken somebody.
Wake your brother up; it's time for school.
To become more aware of a real-life situation; to concentrate on the matter in hand.
From wake + up.
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Some businesses were slow to wake up to the importance of the Internet.