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wouldn't say boo to a goose
wouldn't say boo to a goose
(British informal) also wouldn't say boo/wouldn't say boo to a fly (American/Australian informal/informal) if someone wouldn't say boo to a goose, they are shy and nervous She wouldn't say boo to a goose, so I don't think she's cut out for a career in the police. I remember her as a quiet little girl who wouldn't say boo.