Chinese

		to make a solemn pledge	because of; for; to because of; for; to; act as; take...to be; to be; to do; to serve as; to become	oath; vow; to swear oath; vow; to swear; to pledge
trad. (折箭為誓)		折箭	為	誓
simp. (折箭为誓)		折箭	为	誓

Idiom

折箭為誓

1. to make a solemn pledge