en_tn/2ki/09/23.md

turned his chariot and fled

"turned his chariot around to try to escape"

treachery

Treachery means to trick or to deceive.

with his full strength

"with all of his strength" or "with all of his power"

he sank down in his chariot

"Joram fell down dead in his chariot." (See: rc://en/ta/man/translate/figs-explicit)