He knew Fred would be waiting up for him, but decided to let the old man cool his heels, punishment enough for setting up the evening's activity on the sly.
I'm waiting up to watch a potentially interesting episode of Horizon, about what killed the dinosaurs.
Festive sleepwear helps to engender the mood for late nights filled with hot cocoa, Christmas wishes, and waiting up to catch a glimpse of Santa.
The test is taken by holding a test stick under your urine stream for five seconds, then waiting up two for the test results to show up.
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.