(not) say boo

American, informal

to say nothing.

She expected the boss to be really angry, but he didn't say boo.

• in two shakes
• in two shakes of a lamb's tail
• in unison
• in vain
• in view of
• in view of something
• in way
• in wisdom
• in words of one syllable
• in writing
• in years
• in your birthday suit
• in your blood
• in your corner
• In your dreams!
• in your element
• in-your-face
• in your face
• in your heart of hearts
• in your infinite wisdom
• in your mind's eye
• in your own right
• in your prime
• in your right mind
• in your sights