To take or leave out
To not do (something necessary)
To fail to include
It is simpler and more respectable to omit it.
When he spoke of the execution he wanted to pass over the horrible details, but Natasha insisted that he should not omit anything.
containing the Apocalypse, 50 to 99 for those which omit it.
Under this head we must not omit to mention A.
1 We designedly omit the use of the word " brass " to qualify these instruments.