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lock on (to someone or something)
to fasten or grab onto someone or something. She locked onto the child and wouldn't leave his side for an instant. I saw the thing 1wanted and locked on.
1. To aim something at a moving target so as to follow it automatically: The pilot locked the heat-seeking missile on its target.
2. To stare at someone or something intently; fix one's gaze on someone or something: The detective's eyes locked on the suspicious package under the desk.