Methegammah

Smith's Bible Dictionary

Me'theg-am'mah. (bridle of the metropolis). A place, which David took from the Philistines, apparently, in his last war with them.  2 Samuel 8:1. Ammah may be taken as meaning "mother-city" or "metropolis", compare  2 Samuel 20:19, and Metheg-he-Ammah may mean "the bridle of the mother-city" - namely, of Gath , the chief town of the Philistines.

Morrish Bible Dictionary

Place taken from the Philistines.  2 Samuel 8:1 . The corresponding account in  1 Chronicles 18:1 has 'Gath and her towns' ( lit. daughters). The signification of the name in Samuel is much disputed. Gesenius and Fürst interpret it 'bridle of the mother-city.' This would well agree with 'Gath and her daughter towns.'