hand waving

noun

insubstantial words, arguments, gestures, or actions used in an attempt to explain or persuade.

My maternal grandfather always insisted that I should learn how to speak, not "the hand waving thing."

In another minute Midge was on her sled, and, with one red-mittened hand waving on high, was whizzing down the hill.

And suddenly he saw again Irene's grey-gloved hand waving its last gesture of release.

She saw, however, a dark figure on a couch and a white jeweled hand waving a fan indolently to and fro.

And Heartsease saw her mother's hand waving through the thick bars of the narrow window of the castle.

The lines pass between hand-waving crowds of friends from the entire neighborhood.

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