perverse. Figure of speech Ellipsis (App-6). "perverse [and walketh in double] ways, shall fall in one". See Proverbs 28:6.
fall at once: or fall in one of the two.
Related Commentaries of Proverbs 28:18
Proverbs 28:18
18 Whoso walketh uprightly shall be saved: but he that is perverse in his ways shall fall at once.