talk through one's hat

idiomatic

Japanese Meaning

専門知識や権威、根拠に欠けるままに話すこと。 / 事実を捏造して大言壮語すること。

During the debate, several panelists who lacked credentials felt free to talk through one's hat about medical treatments.

討論会中、資格のない数人のパネリストが専門知識もないのに医療処置について平然と語った。

Sense（1）

(idiomatic) To speak lacking expertise, authority, or knowledge; to invent or fabricate facts.

"Did he, though, Lady Lawless? That's good. Well, I guess he was only talking through his hat."

Sense（2）

(idiomatic) To assert something as true or valid; to bluff.

talks through one's hat

（ present singular third-person ）

talking through one's hat

（ participle present ）

talked through one's hat

（ participle past ）

talked through one's hat

（ past ）