Answer: oox

AnswerCrossword Clue
OOX

Tic-tac-toe block

OOX

Nonwinning game line

OOX

Tic-tac-toe loser

OOX
Losing line
OOX
Sign of a blocked victory
OOX"Hollywood Squares" loser
OOXTic-tac-toe line
OOXLosing tic-tac-toe line
OOXTic-tac-toe nonwinner
OOXLosing game line
OOXLove letter signoff, maybe
OOXLosing tic-tac-toe row
OOXA tic-tac-toe loser
OOXNear miss in tic-tac-toe
OOXNoughts-and-crosses loser
OOXTic-tac-toe failure
OOXLosing line in a children's game
OOXLosing line in tic-tac-toe
OOXIt's for naught in noughts-and-crosses