The phrase "went down" is used here because Timnah is lower in elevation than where his father's house was. Timah is the name of a city in the Sorek Valley. (See: [[rc://en/ta/man/translate/translate-names]])
The word "daughter" is a polite way to refer to a young, unmarried woman. AT: "one of the unmarried women among the Philistine people" or "a Philistine girl" (See: [[rc://en/ta/man/translate/figs-euphemism]])
This is an idiom. Samson was demanding his parents to speak to the Philistine woman's parents about marriage. AT: "Now arrange for her to become my wife!" or "Make the arrangements for me to marry her!" (See: [[rc://en/ta/man/translate/figs-idiom]])