to have someone under one's thumb, to have someone under control
Die vollständige Kontrolle oder Herrschaft über eine Person ausüben, sie nach eigenem Willen lenken.
To have complete control over someone, making them obey one's will.
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Er scheint seine Frau komplett unter der Fuchtel zu haben.— It seems he has his wife completely under his thumb.
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Der Chef hat alle Mitarbeiter streng unter der Fuchtel.— The boss has all the employees strictly under his control.