A supernumerary who plays on both sides to make up a party; one
who for profit or policy is quite colourless.
More on Jack o' both Sides from Infoplease:
- Jack o' both Sides - Jack o' both Sides A supernumerary who plays on both sides to make up a party; one who for ...
- Dictionary of Phrase and Fable: J - Definitions, origins, and illustrative excerpts for words, phases, and literary allusions starting with "J"
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