To speak of something despite having little knowledge of it.
take a shot in the dark
To try or guess at something without having any knowledge about the su …
shot in the dark
A guess, attempt, or choice made with little or no evidence or knowled …
talk through one's hat
To speak lacking expertise, authority, or knowledge; to invent or fabr …
all the gear and no idea
Having high-quality, expensive equipment for a risky or difficult acti …
shoot from the lip
To speak confidently and unhesitantly but without careful forethought …
live a lie
To conceal something about oneself, without the knowledge of which oth …