Answer:

mylipsaresealed

Answer	Crossword Clue
MYLIPSARESEALED	"Don't tell a soul" reply
MYLIPSARESEALED	"Your secret is safe with me"
MYLIPSARESEALED	Non-speaking line?

MYLIPSARESEALED	"Your secret's safe!"
MYLIPSARESEALED	"Mum's the word"
MYLIPSARESEALED	"Mum's the word!"
MYLIPSARESEALED	"I won't tell a soul"
MYLIPSARESEALED	"Mum's the word, friend!"
MYLIPSARESEALED	Pledge of confidentiality
MYLIPSARESEALED	"Shhhh!" response
MYLIPSARESEALED	Mum's the word

MYLIPSARESEALED	"Your secret's safe with me"

Crossword

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