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).
Metheg-Ammah
1 verse
2 Samuel
2 Samuel 8:1
And after this it came to pass, that David smote the Philistines, and subdued them: and David took Methegammah out of the hand of the Philistines.
From Easton's Bible Dictionary
Matthew George Easton, 1897