To disregard, ignore

When you are in a group text and you start a new text group omitting another peron(s) or you are omitted from a group text.
Omit communicate omiticate

to omit you wrong to something

When telling a anecdote, the act of deliberately disregarding one or more integral pieces of information to change to overall tone or intended response from the audience.

One can be a 'Truth Omitter' - a rank down from a 'Lier' in the deceipt table.

to omit to tell an important fact so as to curry favour

To be looking as if you’re leaving out important information so as not to get in trouble