Idioms and Phrases Starting From O

Idioms and phrases starting from O with their meanings.

Idioms and Phrases	Meaning
On a roll	Getting success
On the flip side	On the other side or reverse side
On good terms	Having good relationship
Over one's head	Mentally too difficult to understand
On your last legs	Close to die
Open and above board	Very clear, transparent
Off the scale	Above normal standard
Out of the blue	Spontaneously, out of no where
On its last legs	In a bad condition or it will not last long
Odds and ends	Remaining
Once in a blue moon	Rarely
Over the moon	Very happy
On the dot	The exact time
On pins and needles	Very worried about something
Out of gear	In disorder
Old hat	Out dated or old fashioned
Out of the world	Amazing
On the hook	Responsible for something
Over and above	Besides
Old flames die hard	Very difficult to forget old things