By M. A. Alwar
Sometimes transliterated as: Um, Um, UUm
Ūm is meant as an expression of anger.
Ūm is an indeclinable form.
It is derived from ūyate which can be split as ūy + Muk affix.
Śabdaratnākara states that is also an expression of reproach, competition.
- Shabdakalpadrumah by Raja Radhakantdev, Varadaprasada Vasu, Haricarana Vasu