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, lynchpin
a pin placed transversely through an axle to keep a wheel in position



a wedge-shaped rod that fits into a hole in a part and prevents another part from shifting to one side while fastened to the first part. The shape of a linchpin prevents the pin from falling out of the hole. Linchpins were used in horse-drawn vehicles to prevent the wheels from coming off the axle. They are used for unstrained joints between parts, for example, as safety pins in hand grenades.

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The hotel - which generated controversy over the massive city financing it was granted - has been touted as a linchpin in ensuring the success of the $4.
Campbell noted that the new academic building is the linchpin of Cooper Union's plan to secure the college's academic leadership and it's tradition of granting full-tuition scholarships to all undergraduate students.
In supporting the family internationally, the administration called on Central American countries to recognize that the promotion of the traditional family is the linchpin for successful development.
One might even call it the linchpin of a healthy, thriving culture--the most intimate manifestation, perhaps, of what Francis Fukuyama called "social capital.
Shakespeare, after all, remains the linchpin of the canon, the icon of icons.
The title character of Mary Oslund's astringently funny Reflex Doll, the linchpin for her new piece, provides a much-needed antidote to the sugary excesses of the holiday season.
After investing more than $50 million in the project, Weinstein said he has been approached by several firms that are interested in carrying out his plans for redeveloping the 1927 distribution center site as the linchpin for modernization of a community in need of new retail outlets and affordable housing.
26 Cell that a protein called PGC-l-alpha is the linchpin connecting fasting, glucose, and insulin with porphyria episodes.
It is a linchpin for the reconstruction of High Street,'' said City Councilman Clint Harper.
The linchpin of future downtown revitalization projects, the ShopRite will serve as a model smart growth redevelopment, providing economic benefits, greater consumer choice and environmental enhancements for the community.
Still, it's hard to hold a grudge when the linchpin of Moab is his frank and disarming description of an earthshaking, head-over-heels, wildly romantic schoolboy love for the Perfect Boy, one Matthew Osborne.
Finance Minister Palocci had been a linchpin of fiscal policy in the Lula government, the architect of policies that helped yield primary surplus performance in excess of the target over the three years of President Lula's administration, including 4.