can't say boo to a goose
Is particularly shy, nervous, or diffident. My brother is a very sweet, warm-hearted man who can't say boo to a goose. How can you suspect that he committed this crime?
can't say boo to a goose
Rur. shy and not talkative. I was surprised to see Joe so talkative at the party. Usually he can't say boo to a goose. She's a quiet little kid. Can't say boo to a goose.