I only said it in fun

if only

to be onto someone/something

to be onto something big

oodles

to ooze with charm

I am open to conviction

Open your hand, please.

Open your mouth, please!

to be open to abuse

to be open to advice/suggestions/ideas

to be open to bribes

to be open to debate

to open

to be open to persuasion

to be open to question

An open door may tempt a saint

to open a whole new can of worms

to open Pandora’s box

open a new fiscal year

It’s open house at my place tonight

open and above board

an open and shut case

Open the cupboard on the left.

open position