en_tn/jer/48/21.md

Holon, Jachzah, and Mephaath … Bozrah

These are cities in Moab. (See: rc://en/ta/man/translate/translate-names)

The horn of Moab has been hacked off; its arm has been broken

Both 'horn' and 'arm' mean the same thing. They mean that Moab has been injured. (See: rc://en/ta/man/translate/figs-metaphor and rc://en/ta/man/translate/figs-parallelism)

Yahweh's declaration

See how you translated this in Jeremiah 1:7.