Physical or mechanical sense: the central shaft or pin on which a part turns. Less common in everyday speech than 軸 (じく).
The axle of this machine needs to be oiled regularly.
Figurative use: the most important part around which activity or power revolves. Often used in political, economic, or organizational contexts.
The city has developed as the hub of the regional economy.
He is a person who plays a central role in the party.
the Axis (WWII)
Historical term, almost exclusively used in the compound 枢軸国 (すうじくこく) to refer to the Axis powers of World War II.
See also: 枢軸国
The Axis powers fought against the Allies in World War II.
He is the central figure around whom this plan revolves.
She plays the pivotal role in the company.
The government placed this policy at the core of its national strategy.