1excuse me (i.e. let me through, please)
2reflected glory
3to benefit from sb else's prestige
Example
yuè月běn本wú无guāng光，jiè guāng借光yú于rì日，fǎn返zhào照yè夜zhī之yóu游zǐ子。
月本无光，借光于日，返照夜之游子。
The moon has no light of its own, but rather it reflects the light of the sun to the children of the night.