通气

通气	tōng qì	ventilation / aeration / to keep each other informed / to release information
通	tōng	to go through / to know well / (suffix) expert / to connect / to communicate / open / to clear / classifier for letters, telegrams, phone calls etc
通	tòng	classifier for an activity, taken in its entirety (tirade of abuse, stint of music playing, bout of drinking etc)
气	qì	gas; air / smell / weather / to make angry; to annoy; to get angry / vital energy; qi