Definition of hand-waving in English:

hand-waving

Syllabification: hand-wav·ing

Entry from US English dictionary

noun

The use of gestures and insubstantial language meant to impress or convince: their patriotic hand-waving lacked sincerity [as modifier]: her path of logic and hand-waving explanations

Definition of hand-waving in:

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Word of the day abjure
Pronunciation: əbˈdʒʊə
verb
solemnly renounce (a belief, cause, or claim)