traffic, pass through, avenue, commute, counter for letters, notes, documents, etc.
通 centers on movement along a path: traffic, passing through, commuting, or an avenue. The counter sense extends this to items that travel along a route, like letters or documents.
通 combines 辶 (movement) with 甬, which likely contributes the sound and the idea of a through passage. The character originally expressed going through or penetrating.
The movement radical 辶 wraps around 甬, like a road passing through a tunnel. Traffic flows along this avenue, and letters commute through it.
For ツウ, imagine a two-lane tunnel where traffic passes through: two -> ツウ, and the road 辶 goes straight through 甬.
normal; ordinary; regular; usual; common; average
in accordance with; following
street; road; avenue; thoroughfare
usual; ordinary; normal; regular; general; common
to go by; to go past; to go along; to travel along; to pass through; to use (a road); to take (a route); to go via; to go by way of
correspondence; communication; transmission; news; signal; telecommunications
traffic; transportation
common; shared; mutual
to stick through; to force through
authority; expert; connoisseur; well-informed person
to go to and from (a place); to go back and forth between; to run between (e.g. bus, train, etc.); to ply between
online shopping; e-commerce; mail order
notice; notification; report; posting
currency
passing through (a tunnel, station, town, etc.); passing by (e.g. of a typhoon); transit
(bowel) movement; evacuation; defecation
commuting to work
report; notification; tip; bulletin
circulation (of money, goods, etc.); distribution
telephone call; speaking over the telephone; (Internet) voice call; videoconference call
commuting to school; school commute
passage; pathway; roadway; avenue; aisle
unobstructed view; perspective; visibility; vista
(common) use (of a language, currency, etc.); current use; circulation; currency; validity (e.g. of a ticket)
interpretation (i.e. oral translation)
popular name; common name; nickname; alias
passage (of people or vehicles); passing (through); traffic
literally; to the letter
to be open (to traffic); to lead to; to communicate (with)
total; sum; aggregate
passing through (of a tunnel, bullet, etc.); going (right) through; penetrating; piercing
announcement; notice
opening (of a new road, railway, etc.); going into operation (e.g. telephone communication); beginning services
being well versed (in); being well acquainted (with); being familiar (with); having a thorough knowledge (of); being an authority (on)
main street; avenue; boulevard
suspension; interruption; stoppage; tie-up; cessation
lending (money, commodities, etc.); finance; loan
going to the hospital regularly for treatment; attending hospital as an outpatient
notification; official notice; directive (e.g. from higher to lower levels of the administration)
direct line; direct communication; connecting directly; through service; nonstop service
(mutual) understanding; communication
commerce; trade
passbook; bankbook
closure (of a road); suspension of traffic
all year; year round
all-night vigil over a body; wake
custom; general rule; convention
data communication
to go past; to pass; to pass by
correspondence; exchange of letters
ventilation
common idea; common wisdom; generally accepted idea
pedestrian traffic
customs clearance
side street (often parallel to a main street); back street; alley; alleyway
to be transparent; to be see-through; to be clear
main street (as opposed to a side street); high street
generally; in the main; briefly (look over, explain, etc.); roughly; more or less
to go through; to pierce; to penetrate
Ministry of International Trade and Industry (1949-2001); MITI
as always; as usual
one-way traffic
one copy (of a document); one letter
traffic accident
(means of) transportation; transport; transportation facilities; transportation system; transit system
transportation network; transport network; traffic network
traveling expenses; travelling expenses; carfare
to resemble closely
point in common; common feature
common language; lingua franca
(reciprocal) communication; (coming to a) mutual understanding
universal suffrage
ordinary deposit
to scan; to look over
as you know; as we know
as promised
coming and going; going back and forth (between); running between; circulating
continuing from beginning to end; continuous run; consecutive run
popular; common; commonplace
news agency
communications network
communication satellite; Broadcast Satellite; BS
online shopping service (with delivery by mail); mail order; mail-order sales; shop-by-mail service
Minister of International Trade and Industry
telecommunications
University of Electro-Communications