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Advanced idioms 1
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"The ________ in the coalmine"
The canary in the coalmine
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"Let's put our ______ caps on"
Let's put our thinking caps on
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"Nuts and _____"
Nuts and bolts
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"In a ________"
In a nutshell
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"Meat and ______"
Meat and potatoes
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"Rack your _______"
Rack your brains
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"The bare ______"
The bare bones
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"Rock the _____"
Rock the boat
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"Go round in _______"
Go round in circles
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