means A goalkeeper — the player stationed at the goal whose job is to stop the ball from going in — or, more broadly, anything or anyone worth holding onto.

from From Old English 'cepan,' to seize, hold, or guard, giving us 'keep' and then 'keeper' — one who keeps. The word has worn many uniforms over the centuries: gamekeepers minding estates, zookeepers minding beasts, shopkeepers minding tills. In football it shortens 'goalkeeper,' the one tasked with keeping the goal empty, and in love it survives in 'she's a keeper' — both senses sharing that same old instinct to hold tight to what matters.