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boo

Pronunciation: (bOO), [key]
—interj., n., pl. boos,
—v., booed, boo•ing.

—interj.
(used to express contempt or disapprobation or to startle or frighten).

—n.
an exclamation of contempt or disapproval: a loud boo from the bleachers.

—v.i.
to cry boo in derision.

—v.t.
to show disapproval of by booing.