| Idiom | Meaning | Example |
| onto something |
found some important information
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Nick looks very confident. I think he's onto something.
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| onto us |
knows that we are doing bad things, wise to us
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The doorman is onto us. He knows we didn't buy a ticket.
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| oodles |
lots, more than we need, scads
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"Do we have enough salad?" "Yes. Oodles!"
|
| open a can of worms |
(See can of worms)
|
|
| open a window |
find a new way of looking at a topic or problem
|
That idea opens a window on the causes of war. What do you see?
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| open and shut |
easy to judge, not complex
|
If either spouse admits adultery, divorce is an open and shut case.
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| open mind |
(See keep an open mind)
|
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| open season |
legal to hunt or kill at this time
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Nancy said there should be an open season on sex offenders.
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| open some doors |
provide opportunities, help someone succeed
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I'm hoping my college diploma will open some doors.
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| open to criticism |
in a position that can be criticized, vulnerable
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If you become a politician you will be open to criticism.
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