Grammar: Phrasal verbs
What are phrasal verbs
The term phrasal verb refers to a verb and preposition which together have a special meaning. For example, call off means "cancel." Phrasal verbs are also known as two-word verbs or three-word verbs.

 

 
Examples:

Every mother has to bring up her children properly: Rear them.

I like to call on friends : Visit them.

Sales dropped off in the fourth quarter : They decreased