A person or thing that weakens or drains someone's strength and energy.
From Latin 'enervare' meaning 'to weaken' (en- + nervus 'nerve, strength'), combined with the agent suffix -or. The root suggests the removal of nerve or vital force.
The word 'nerve' itself comes from the Latin nervus, which originally meant both the physical cords in your body AND metaphorical strength—so calling someone 'nervy' literally means they have the vitality to be bold!
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