en_tn/psa/089/019.md

The writer assumes that the reader knows the history of how David became the chosen king. (See: rc://en/ta/man/translate/figs-explicit)

My hand will support him; my arm will strengthen him.

"Hand" and "arm" both means the power and control of Yahweh. (See: rc://en/ta/man/translate/figs-metonymy and rc://en/ta/man/translate/figs-parallelism)

son of wickedness

The writer refers to those who have the nature or character of wickedness as "sons of wickedness." (See: rc://en/ta/man/translate/figs-metonymy)