Meaning : To close within bounds, or otherwise limit or deprive of free movement.
This holds the local until the express passengers change trains.
About a dozen animals were held inside the stockade.
The illegal immigrants were held at a detention center.
The terrorists held the journalists for ransom.
Constrain ka meaning, vilom shabd, paryayvachi aur samanarthi shabd in Hindi. Constrain ka matlab kya hota hai?