Used mainly to describe a wrestling or martial arts move, where physical strength is key. During the Judo match, he quickly grabbed his rival and put him in a headlock.
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Informal Expression
'Headlock' can be used metaphorically in a playful or informal context among friends. My big brother always messes with me, giving me noogies and putting me in headlocks.
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Power Dynamics
May imply a power imbalance, with one person dominating or controlling another. The debate soon turned into a verbal headlock, with one speaker dominating the conversation.