▪ Prob. simply extended use of ↗²karkara, esp. in the expression karkara fī ’l-ḍaḥk ‘to burst into loud laughter, roar with laughter’, hence (?) also ‘action producing laughter’. ▪ …
For other values attached to the root, cf. ↗¹karkara and ↗²karkara as well as, for the overall picture, root entry ↗KRKR. – Cf. also ↗KRː (KRR), ↗KRW, ↗KRW/Y, and ↗KRY.