Meaning : Break down, literally or metaphorically.
The wall collapsed.
The business collapsed.
The dam broke.
The roof collapsed.
The wall gave in.
The roof finally gave under the weight of the ice.
Meaning : To take one's place in a military formation or line.
Troops fall in!.
Fall in ka meaning, vilom shabd, paryayvachi aur samanarthi shabd in Hindi. Fall in ka matlab kya hota hai?