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
Balloon goes up

When brain starts working
When the plane starts flying
When expected trouble begins
When the plan is successful

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Idiom
Swan-song

Music as sweet as a song of birds
A melodious song in praise of someone
Last work of a poet or musician before death
Praise of a woman by her lover

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