白條

IOU / informal document acknowledging a debt

white / snowy / pure / bright / empty / blank / plain / clear / to make clear / in vain / gratuitous / free of charge / reactionary / anti-communist / funeral / to stare coldly / to write wrong character / to state / to explain / vernacular / spoken lines in opera

strip / item / article / clause (of law or treaty) / classifier for long thin things (ribbon, river, road, trousers etc)

to write an IOU or promissory note