Etymology

used to

Today it means: Accustomed to, tolerant or accepting of. Full definition →

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used to · adjective1

From used, past participle of use (“(archaic sense) to be in the habit of”) + to.

used to · verb2

From used, past of use (“(archaic sense) to be in the habit of”) + to (“infinitive marker”).

Etymology from Wiktionary, CC BY-SA 4.0.