Meaning of the word "have reason to do" in English

What does "have reason to do" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

have reason to do

US /hæv ˈriː.zən tu duː/
UK /hæv ˈriː.zən tə duː/
"have reason to do" picture

Idiom

to have a good or valid cause to believe or do something

Example:
I have reason to believe that he is lying.
You have no reason to feel guilty about the accident.