When is lying about the Messenger considered a lie, and is omitting a word from a Hadith or narrating it by its meaning considered distortion and a lie?

Lying about the Prophet, peace and blessings be upon him, is to report about him what he did not say or do, and it is one of the major sins. What was mentioned is not lying about the Prophet, peace and blessings be upon him; rather, it falls under transmitting a Hadith by its meaning, which is permissible with its controls and conditions.