阋 鬩 xi4
to argue; to quarrel

strokes 11
radical
门
門
strokes after radical 8
兄弟阋墙 兄弟鬩牆 xiong1 di4 xi4 qiang2
internecine strife (idiom); fighting among oneself

兄弟阋于墙，外御其侮 兄弟鬩於墻，外禦其侮 xiong1 di4 xi4 yu2 qiang2 - wai4 yu4 qi2 wu3
internal disunity dissolves at the threat of an invasion from outside (idiom)