The phrasal verb "wake up" is predominantly used in informal speech, although it can appear in formal contexts, particularly when discussing topics related to sleep patterns or waking mechanisms in scientific or psychological studies. Generally, "wake up" is used to refer to the act of stopping sleep and becoming conscious or alert, and it is a ubiquitous term in everyday language due to its direct and universally relatable nature. This phrase can also be used metaphorically to indicate becoming aware or alerted to a new or important reality, such as in sentences like "It's time to wake up to the facts." The versatility in contexts, combined with its simplicity, makes "wake up" a staple in both spoken and written language.
A2
Elementary
1. To stop sleeping and become conscious.
I usually wake up at 7 AM.
She woke up in the middle of the night because of a loud noise.
2. To become aware or start paying attention to something.
He needs to wake up to the reality of the situation.
It’s time you woke up and noticed the opportunities around you.