en_tn/2sa/20/03.md

to keep the palace

"to take care of the palace" or "in charge of the palace"

he put them in a house under guard

AT: "he put them in a guarded house because they had slept with his son, Absalom, and were now defiled" (See: rc://en/ta/man/translate/figs-explicit)

widows

These are women whose husbands have died.