blind copy

10 LETTERS · STARTS WITH B

blind copy is a valid 10-letter word worth 19 points in Scrabble and 23 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

B3L1I1N1D2C3O1P3Y4

3 + 1 + 1 + 1 + 2 + 0 + 3 + 1 + 3 + 4 =19 PTS

DOUBLE WORD → 38TRIPLE WORD → 57

MEANING

What does blind copy mean?