hand-waving

hand waving

noun
insubstantial words, arguments, gestures, or actions used in an attempt to explain or persuade.
Also, hand-wav·ing, hand·wav·ing [hand-wey-ving] .
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Hand-waving is always a great word to know.
So is interrobang. Does it mean:
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 screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Dictionary.com's 21st Century Lexicon
Main Entry:  hand-waving
Part of Speech:  n
Definition:  a hand signal that one does not want to give a full explanation; also, an argument that is not fully supported or fully convincing
Usage:  informal
Dictionary.com's 21st Century Lexicon
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