Cách sử dụng
"Not say boo to a goose" is an idiom which means someone is very quiet, shy or timid. People use this idiom to describe someone who is so shy that they are afraid to speak up or make noise, just like a goose would not be bothered by a person who is really quiet. This expression can be used in different contexts, such as describing someone who is nervous around people or someone who is afraid to take risks.