nagh 'ughqu' 'uchmo' ghorrup 'uSDaq.

because he was holding a very heavy rock his leg was ready to break.

besides this example, if a bone of the leg e.g. tibia, has a large osteolytic area, then (depending on various criteria) that bone can be ready to break. it is what we call "impending fracture".

-rup and -beH refer to preparedness, not impendency.

-- 
SuStel
http://trimboli.name