Derived words: baršu ‘describing the hair as growing in patches’ (CAD B 113, AHw. 107); biršu ‘teaseled nap of a woolen fabric’ (CAD B 261, AHw. 129); burrušu ‘with hair growing in patches’ (CAD B 332, AHw. 140).
May be related to Arb. brs II ‘to make the ground smooth and soft’.