通

meaning for 通 tōng:

• - to go through
• - to know well
• - (suffix) expert
• - to connect
• - to communicate
• - open
• - to clear
• - classifier for letters, telegrams, phone calls etc

meaning for 通 tòng:

• - classifier for an activity, taken in its entirety (tirade of abuse, stint of music playing, bout of drinking etc)