In 2:4-15, Yahweh announces his judgment on the nations that surround Judah.
# the taunts ... the reviling
"the taunts ... the insults." These two phrases mean the same thing and emphasize that both Moab and Ammon have insulted Yahweh. (See: [[rc://en/ta/man/translate/figs-parallelism]])
# violated their borders
This refers to crossing over into Judah's territory in order to attack them.