√rup 'break, pain'
present: [4.] r/upyati etc. [perfect: ruropa ]aorist: [2.] arupat -- [3.] arUrupat etc. [future: ropizyati ropitA ]verbal: rupita causative: ropayati derivatives: ropaR/a r/opi AV. r/opuzI RV. Probably the same with √lup, though differentiated from it in meaning.