I need to learn some expressions [closed]

I saw this short sentence in the Merriam Webster.

"slopes off into the night" — Wolcott Gibbs

What does "slopes off into the night" mean in this case?

Thanks.


The Merriam-Webster dictionary doesn't really give a good explanation of this.

From the Oxford Dictionary Online

British, informal slope off: Leave unobtrusively, typically in order to evade work or duty.
‘the men sloped off looking ashamed of themselves’

So it means to leave unobtrusively, under the cover of darkness.