1.
main force, mainstay, key player
The primary strength or most important element of a group, team, army, or business. Used to identify what or who carries the greatest weight or responsibility.
彼はチームの主力だ。
He is the key player of the team.
この会社の主力商品はスマートフォンだ。
This company's main product is smartphones.
主力選手が怪我で出場できず、チームは苦戦した。
The star player couldn't compete due to injury, and the team struggled.
USAGE:
主力 is used across many domains: sports (key players), business (main products/markets), and military (main forces). It functions both as a standalone noun and as a modifier.
COMMON COLLOCATIONS:
- 主力選手: star player, key player
- 主力商品: flagship product
- 主力事業: core business
- 主力部隊: main force (military)