The idiomatic phrase to latch on someone means to become emotionally, socially, or physically attached to a person, often clinging to them persistently, following them closely, or depending heavily on their presence, approval, or guidance. Derived from the literal physical action of an infant latching onto a mother's breast for feeding, the metaphorical usage describes someone who attaches themselves tenaciously to a friend, mentor, group, or romantic partner. In casual conversation, it can also signify the moment a person suddenly understands or grasps a complex concept, idea, or plan, as in he finally latched on to the instructions after a brief explanation.
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