en_tn/deu/33/17.md

Moses continues blessing the tribes of Joseph.

The firstborn of an ox, majestic is he

AT: "Joseph's descendants are powerful like a firstborn bull" (See: rc://en/ta/man/translate/figs-metaphor)

firstborn of an ox

Here "firstborn" and "ox" represent superiority and strength.

his horns are the horns

Here "horns" are also represent strength.

ten thousands of Ephraim...the thousands of Manasseh

This means the tribe of Ephraim will be stronger than the tribe of Manasseh. AT: "the 10,000 of Ephraim...the 1,000 of Manasseh" (See: rc://en/ta/man/translate/translate-numbers)