Only when written 瀬
A shallow place in a river or stream, often contrasted with 淵, a deep pool.
See also: 淵
We walked across the shallows of the river.
Only when written 瀬
Limited and somewhat literary in modern Japanese, especially in compounds or set phrases such as 逢う瀬, a chance or occasion to meet.
The canoe went down the rough rapids.
After being scolded in front of everyone, he had no place to stand.
The two looked forward to their once-a-year chance to meet.
急流 explicitly means a fast, rushing current, whereas 瀬 refers more specifically to the particular rapid section of a river.
機会 is the ordinary word for an opportunity, while 瀬 in this sense survives only in literary or fixed expressions like 逢う瀬.
瀬 is the broader word covering shallows, currents, or rapids in a river, whereas 高瀬 specifically denotes a shallow stretch.
瀬 broadly means shallows or a stretch of river, while 早瀬 adds the nuance of fast-moving water.
strait; channel
shallow river; river shallows · flatboat; river boat
shoal; shallows; sand bar; ford
Japanese wobbegong; Japanese carpet shark; fringe shark
miserable; wretched; helplessly sad
rapids; shallows
swift current; rapids
secret lovers' meeting; rendezvous; tryst
sea current; tidal current
Standard kanji spelling for the physical river meanings and for fixed abstract expressions such as 立つ瀬 and 逢う瀬.
Rare alternative kanji associated with fast-flowing water or rapids; not a practical spelling for the abstract idiomatic senses.
Native Japanese せ with conventional kanji spellings for water-related meanings. The character 瀬 uses the water radical, matching the river sense; the historical derivation of the word itself is uncertain. 湍 is a rare alternative character associated with rapids or swift water.
nakaseite
many rapids; many torrents
Japonolirion osense
sailing trawlnet
drying up of a riverbed surface
ship-to-ship cargo transfer; off-shore delivery into smaller boats
Corbicula sandai; Seta freshwater clam
sounding out; measuring the depths
one's standing; one's face; one's honor