Used to show movement or change from the outside to the inside of something, or a change in state or condition.
From Old English *into* formed from *in* + *to*, both common prepositions in Germanic languages. Over centuries, it fused into a single word indicating motion toward the inside.
“Into” is tiny but powerful: it marks the moment of crossing a boundary—into a room, into trouble, into love. English even uses it for feelings: being “into” something means your interest has moved deep inside you.
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