|call one's bluff|
|ask to prove what someone is claiming; "John called Mary's bluff when she claimed she could prove the theorem in under an hour"|
|a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.|
|a chattering or flighty, light-headed person.|
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