counter for flags, banners, etc.

flow (of a fluid or gas), stream, current...

exchange (e.g. cultural), interchange, interaction...

circulation (of money, goods, etc.)...

as one would expect, just as you'd expect (from), just like (someone)...

fluent (in a language), flowing

to be popular, to come into fashion, to be prevalent...

fluent (in a language), flowing

to drain, to pour, to run...

sink (e.g. in a kitchen), cruising (e.g. taxi), strolling (entertainer...

fashion, fad, vogue...

downstream, lower reaches of a river, lower classes

upper stream, upper course, upper reaches...

electric current

(the) mainstream, main course (of a river), main stream

banishment (to a somewhat distant province), middle-degree punishment of the three banishment punishments under the ritsuryō system

outflow, effluence, efflux...

to stream, to flow (liquid, time...

drainage basin, catchment basin, river basin...

bloodshed

flow

inflow, influx

ocean current

second-rate, inferior

tide, tidal current, tendency...

elegance, taste, refinement

popular song

pyroclastic flow

pyroclastic flow

school (of painting, ikebana, etc.)