conc▪ Apparently related to ↗labab ‘breast collar (of a horse’s harness)’ (orig. *‘chest strap preventing the saddle from slipping backwards’) and ↗labbaẗ ‘upper part of the chest; throat of an animal, spot where its throat is slit in slaughtering’.
▪ Perh. also related to ↗lubb ‘kernel, core, essence, heart’, but nature of relation unclear.