Dictionary Definition:
upa-√śam P. Ā. -śāmyati, -te, to become calm or quiet
• to cease, become extinct AitBr. Kauś. ĀśvGṛ. ChUp. MBh. &c.: Caus. -śamayati and ep. -śāmayati, to make quiet, calm, extinguish
• to tranquillize, appease, pacify, mitigate MBh. VarBṛS. Daś. &c