- The definition of wake-up is a service where guests are awakened by a phone call at a time specified by the guest.
An example of wake-up used as an adjective is in the phrase "wake-up call," which is a call to a guest's room at a hotel to get him or her up in the morning.
- Wake up is defined as to stop sleeping or to cause someone to stop sleeping.
An example of wake up is to get out of bed at 6 a.m.
wake-up definition by Webster's New World