I was reading an art history book on western art and I came across the word jamb, surprised, I had to look up the meaning. And this is what I got: pronunciation
(IPA): /dʒæm/
noun (plural jambs)
(architecture) The vertical components that form the sides of a door frame, window frame, or fireplace, or other opening in a wall.
(mining) Any thick mass of rock that prevents miners from following the lode or vein... And so probably, while some people pass through the door, others simply hit the rocks! While some among the later will continue drilling like resilient miners, others quickly throw in the towel. Lol!

Ewoooo!!! No wonder we grew tired and old from it. And post jamb was scrapped cus two rocks, too much.

seen