Idiom
He never liked the idea of keeping his wife under his thumb and so he let her do what she liked.

Unduly under control
Under tyrannical conditions.
Below his thumb
Pressed down

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Idiom
Which statement regarding the mammalian heart is correct?

Oxygen-loaded blood moves only through the right side of the heart
Blood is pumped from the heart via the atria
In the adult heart, blood in the right chambers of the heart cannot enter the left chambers without passing through the lungs
When the right atrium contracts, it forces blood into the left atrium

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