english
1
general::
See BETTER BELIEVE IT.
American Heritage Idioms
2
general::
Phrase(s): You(‘d) better believe it! Inf. a way of emphasizing a previous statement. • Bill: Man, you’re the best goalie this team has ever had! Tom: You better believe it! • Bill: This food is so bad. It will probably stunt my growth. Tom: You’d better believe it!
McGrawhill's American Idioms And Phrasal Verbs