Lynchpin(noun)
A person or thing that is the most important part of an organization, a plan, etc., because everything else depends on them or it.
Hindi meaning:सर्वाधिक महत्वपूर्ण व्यक्ति
Synonyms: Backbone, Chief, Heart, Kernel
Example: Nurses are the lynchpin of the National Health Service. <br><br> The lynchpin to maintaining worker safety and efficiency is preplanning. <br><br> They're the linchpin of Republican efforts to hold the House.
Trick to remember: Parents ek family ke liye lynchpin hote hain. 
