1. (used to express contempt or disapprobation or to startle or frighten). noun, plural boos.
2. an exclamation of contempt or disapproval: a loud boo from the bleachers. verb (used without object), booed, booing.
3. to cry boo in derision. verb (used with object), booed, booing.
4. to show disapproval of by booing.
"prime ministers can be booed."
"sides can be booed."
"decisions can be booed."
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