What are Phrasal Verbs?

Phrasal verb is the name given to an English verb which is composed of two or three words. One verb is combined with a preposition (like on, in, under) or an adverb (like up, down, away). Sometimes a phrasal verb can have a meaning that is very different to the meaning of at least one of those two or three words separately. Some text books call these verbs multi-word verbs. Phrasal verbs are used more frequently in everyday speech than in formal, official writing or speaking.

Here are some examples:

To Look Up To
He looks up to his father.
To Zonk Out
Jill was so exhausted after taking the TOEFL test that she zonked out before dinner.
To Zoom In On
She zoomed in on his face while taking the picture.
To Yak On About
She just yakked on and on about her husband's new job.
To Call In
We had to call in a plumber because the sink was leaking and I had no idea how to fix it.