English

in on

Being or made privy to, a participant in, involved in, included in, or informed of (usually something private or secret, especially a plan or plot).

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    Origin

    Extracted from let in on.

    From Wiktionary, CC BY-SA 4.0.

    Lineage

    • derivedEnglishlet “To allow to, not to prevent (+ infinitive, but usually without to).”
      • derivedMiddle Englishleten
        • derivedOld Englishlǣtan “to allow, let go, bequeath, leave, rent”
      • derivedMiddle Englishletten “to hinder, delay”
        • derivedOld Englishlettan “to hinder, delay”; literally, “to make late”

    Sources