pitch (one) a line

pitch (one) a line

To tell a lie or only part of the truth in order to convince someone of something or to avoid the consequences of something. Don't you dare pitch me a line about being at the library. I want to know exactly where you were tonight. I suspect he's just pitching a line about where all that money came from.
See also: line, pitch

ˌpitch a ˈline/ˈstory/ˈyarn (to somebody)

(informal) tell somebody a story or make an excuse that is not true: He assured me that it really happened, but I reckon he was just pitching me a line.
See also: line, pitch, story, yarn