Say-so

//ˈseɪˌsəʊ// noun, slang

Definitions

Noun
  1. 1
    Authority, as backing some statement, injunction, or command. informal

    "I wouldn't buy anything that expensive just on the say-so of a saleman."

  2. 2
    the power or right to give orders or make decisions wordnet
  3. 3
    an authoritative declaration wordnet
  4. 4
    one chap's arbitrary assertion wordnet

Etymology

From say + so.

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