Значение идиомы unknown quantity

[unknown quantity] {n.} Someone or something whose value andimportance are not known, especially in a certain situation, time orplace; a new and untested person or thing.

What we would find if wecould fly to the moon is an unknown quantity.

The new player isstill an unknown quantity. We’ll find out how good he is in the game.


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Значение идиомы unknown quantity