隔水

隔水	gé shuǐ	(old) (of a half-sibling) having the same father but different mother
隔	gé	to separate / to partition / to stand or lie between / at a distance from / after or at an interval of
水	Shuǐ	surname Shui / Shui ethnic group
水	shuǐ	water / (after a name) ... River / to swim (used mostly in 会水 and 水性) / (coll.) lacking in substance; shoddy / (bound form) additional cost; extra income / classifier for washings of a garment