Answer:

XOX

Answer	Crossword Clue
XOX	Tic-tac-toe loser
XOX	Tic-tac-toe line
XOX	Losing line in tic-tac-toe

XOX	Pencil game loser
XOX	Noughts-and-crosses line
XOX	Affectionate sign-off
XOX	Certain losing line
XOX	Losing row
XOX	Worthless tic-tac-toe row
XOX	Losing tic-tac-toe line

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.