私交

私交	sī jiāo	personal friendship
私	sī	(bound form) personal; private / (bound form) selfish / (bound form) clandestine / (bound form) illicit / (Internet slang) to send a private message to sb
交	jiāo	to hand over; to deliver; to pay (money); to turn over / to make friends / (of lines) to intersect / variant of 跤