lynchpin

• Nom désignant une personne ou une chose essentielle qui assure la cohésion et la stabilité d'un ensemble, ou une cheville métallique insérée dans un essieu pour maintenir une roue en place.

A noun referring to a central, cohesive source of support and stability, or a pin inserted through an axletree to hold a wheel on.

1. Central support or foundationC1formal

   A person or thing that is the most important support or stabilizing element of a group, system, or process.

   Clé de voûte

   • She is the lynchpin of the entire project, without whom nothing would function.
   • Trust is the lynchpin of a healthy relationship.
   • His leadership serves as the lynchpin for the company's success.

   Synonymesanchorbackbonebedrockcornerstonefoundationhubkeystonemainstaypillarpivot

2. Mechanical fastenerB1formaltechnical

   A pin inserted through an axle to prevent a wheel from sliding off, used in vehicles and machinery.

   Goupille de sécurité

   • The wheel is secured by a lynchpin through the axle.
   • He replaced the rusty lynchpin on the cart.
   • A missing lynchpin caused the wheel to detach.

   Synonymescotter pin