talk through one's hat

Definitions

1. To speak lacking expertise, authority, or knowledge; to invent or fabricate facts.
   idiomatic
2. To assert something as true or valid; to bluff.
   idiomatic

Equivalents

Examples

“"Mr. Pride said to me a moment ago that they spoke better English in Boston than any other place⟳ in the world." "Did he, though, Lady Lawless? That's good. Well, I guess⟳ he was only talking through his hat."”

“No, sir, she yust standing pat, / And vonce more she tal her father, / “Yu ban talking tru yure hat!””

“He's conceited and opinionative and argues all the time, even when he knows perfectly well that he's talking through his hat.”

CEFR level