hold the key

hold the key

To contain or provide the missing element or necessary explanation for something. Scientists are scouring the rainforest for medicinal plants in the hope that one of them holds the key to curing cancer. This passage holds the key to understanding the entire novel.
See also: hold, key
References in classic literature ?
Had I even the secret of one such mind, did I hold the key to the fancy of even one lunatic, I might advance my own branch of science to a pitch compared with which Burdon-Sanderson's physiology or Ferrier's brain knowledge would be as nothing.
Orangutans can control their voice in a similar way to humans, with new research suggesting they may hold the key to how human speech evolved.
The group was founded by entrepreneur Ean Parsons in 2000 in Sedgefield, County Durham, and is now one of the UK's largest multi-discipline shipping container businesses, operating its container division alongside selfstorage business U Hold the Key, which has sites across the North and Lincolnshire.
Global Banking News-December 10, 2018--Former Tesco Bank CEO says retailers hold the key to future banking operations
M2 EQUITYBITES-December 10, 2018--Former Tesco Bank CEO says retailers hold the key to future banking operations
BANKING AND CREDIT NEWS-December 10, 2018--Former Tesco Bank CEO says retailers hold the key to future banking operations
Summary: Kathmandu [Nepal], June 22 (ANI): Nepal Prime Minister KP Sharma Oli said that political parties hold the key to development, prosperity and good governance as they not only steer the present political course of a country but also shape its future direction.
Anne Robinson is going to have a go at finding out a few tips, however, during this programme - and meets five couples from very different backgrounds who really do believe they hold the key to unlocking marital happiness.
Sedgefield, County Durham-based, Parsons Containers Group, has obtained a new Darlington site for its U Hold The Key self-storage business.
But I hold the key, and it's me who holds the key to the fight game.
HARRY POTTER AND THE DEATHLY HALLOWS: PART 1 ITV, 7pm The dark lord Voldemort rises to ultimate power over the magical world, so the teenage wizard and his friends set out on a mission to find the magical horcruxes - artefacts containing parts of the evil wizard's soul that hold the key to destroying him.