talk through one's hat
Talk nonsense; also, hold forth about something one knows very little about. For example, He was talking through his hat when he described the shipwreck, or Mother went on and on about various screwdrivers but in fact she was talking through her hat. The allusion in this idiom makes no sense either, which may be the point. [Late 1800s]
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How to use talk through one's hat in a sentence
Fluoride first entered an American water supply through a rather inelegant technocratic scheme.
Added to drinking water at concentrations of around one part per million, fluoride ions stick to dental plaque.
In his view, a writer has only one duty: to be present in his books.
Yet this, in the end, is a book from which one emerges sad, gloomy, disenchanted, at least if we agree to take it seriously.
We see detoxing as a path to transcendence, a symbol of modern urban virtue and self-transformation through abstinence.How Taryn Toomey’s ‘The Class’ Became New York’s Latest Fitness Craze|Lizzie Crocker|January 9, 2015|DAILY BEAST
Practise gliding in the form of inflection, or slide, from one extreme of pitch to another.Expressive Voice Culture|Jessie Eldridge Southwick
He alludes to it as one of their evil customs and used by them to produce insensibility.
There was a rumor that Alessandro and his father had both died; but no one knew anything certainly.Ramona|Helen Hunt Jackson
Truth is a torch, but one of enormous size; so that we slink past it in rather a blinking fashion for fear it should burn us.Pearls of Thought|Maturin M. Ballou
Before Ripperda could unclasp his lips to reply, the stranger had opened the door, and passed through it like a gliding shadow.The Pastor's Fire-side Vol. 3 of 4|Jane Porter