Controlled, dominated, or heavily influenced by someone.
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Completely under someone else's control, with very little freedom.
When you are under someone's thumb, that person dictates what you do and you have little say in your own choices.
It's used with a negative tone, implying the control is unfair or limiting.
"At Someone's Beck and Call"
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Available to respond to every demand, more about availability than control
"Under Someone's Spell"
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Completely enchanted or influenced by someone, often with a positive or romantic tone
"Under Someone's Thumb"
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Being controlled and restricted by someone else with little freedom to decide