Metheg-ammah

bridle of the mother, a figurative name for a chief city, as in
2 Sam. 8:1, "David took Metheg-ammah out of the hand of the
Philistines" (R.V., "took the bridle of the mother-city"); i.e.,
subdued their capital or strongest city, viz., Gath (1 Chr.
18:1).