1.
mainstream, predominant trend
The dominant or most widely accepted current of thought, practice, or culture. Can also refer literally to the main current of a river.
それが今の主流だ。
That's the mainstream now.
オンライン授業が主流になりつつある。
Online classes are becoming the mainstream.
かつては手書きが主流だったが、今はほとんどパソコンで作成する。
Handwriting used to be the norm, but now almost everything is done on a computer.
COMMON COLLOCATIONS:
- 主流になる (to become mainstream)
- 主流から外れる (to deviate from the mainstream)
- 主流派 (mainstream faction)
The literal meaning of 主流 is "main stream" (of a river), but the figurative sense of "dominant trend" is far more common in everyday use.