Fred has a date with Mrs. Abernathy and won't be home for supper but wants you to wait up for him.
He remembered Fred O'Connor left word for Dean to wait up for him but it was already 11:00 and he figured he could wake Fred in the morning.
I'm sure Mr. Dean doesn't want to wait up for an out-of-shape old lady lagging behind him.
Don't wait up for the Easter Bunny for that one.
The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.