Answer:

yack

Answer	Crossword Clue
YACK	Chatter: Slang var.
YACK	Chatter: Slang
YACK	Gab

YACK	Talk, talk, talk: Var.
YACK	Talk idly
YACK	Chatter
YACK	Talk on and on (Var.)
YACK	Talk on and on
YACK	Talk tiresomely (Var.)
YACK	Talk idly (Var.)
YACK	Chatter, prattle or gab

Crossword

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