lie upon verb3 •To lie on.She was lying upon the bed. •(no longer used) To be incumbent upon; to be up to (someone); to be obligatory upon.It lies upon the prosecution to prove that the defendant is guilty. •(no longer used) To importune; to urge; to solicit.The judge in the parable granted the widow's suit merely because she lay upon him, and was troublesome to him. formslay upon · lain upon · lying upon · lies upon