Идиомы и фразеологизмы английского со словом know. Страница пять

Фразеологизмы со словом know. Страница пять

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unknown quantity
Someone or something whose value and importance are not known, especially in a certain situation, time or place; a new and untested person or thing.
What we would find if we could fly to the moon is an unknown quantity.
The new player is still an unknown quantity. We'll find out how good he is in the game.