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hand waving

noun
1.
insubstantial words, arguments, gestures, or actions used in an attempt to explain or persuade.
Also, hand-waving, handwaving [hand-wey-ving] /ˈhændˌweɪ vɪŋ/ (Show IPA).
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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