Answer: mylipsaresealed

AnswerCrossword Clue
MYLIPSARESEALED"Don't tell a soul" reply
MYLIPSARESEALED"Your secret is safe with me"
MYLIPSARESEALEDNon-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!"
MYLIPSARESEALEDPledge of confidentiality
MYLIPSARESEALED"Shhhh!" response
MYLIPSARESEALEDMum's the word
MYLIPSARESEALED"Your secret's safe with me"