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hand waving

noun
  1. insubstantial words, arguments, gestures, or actions used in an attempt to explain or persuade.
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Also hand-wav·ing, hand·wav·ing [hand-wey-ving] /ˈhændˌweɪ vɪŋ/.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018