切磋

切磋	qiē cuō	to compare notes; to learn from one another
切	qiē	to cut; to slice; to carve / (math) tangential
切	qiè	definitely; absolutely (not) / (scoffing or dismissive interjection) Yeah, right.; Tut! / to grind / (bound form) close to / (bound form) eager / to correspond to / (used to indicate that the fanqie 反切 system should be applied to the previous two characters)
磋	cuō	(old) to polish bones, horns, ivory, etc into tools / (bound form) to deliberate; to consult