xiōng dì xì yú qiáng , wài yù qí wǔ
internal disunity dissolves at the threat of an invasion from outside (idiom)
兄
xiōng
elder brother
弟
dì
younger brother
阋
xì
to argue
于
yú
(of time or place) in; at; on
墙
qiáng
wall (CL:面[mian4],堵[du3])
，
,
外
wài
outside
御
yù
(bound form) to defend; to resist
其
qí
his
侮
wǔ
to insult
