क्त

क्त = क् त
accomplished, hand held tumbi, hand held that, syone that, hand held floating
Stone tumbi

क = stone, hand held, what
त = that, way of, tumbi

commentary
While makinng fish trap if the tumbi remainned above water level, fish will be able to come in.So the whole apparatus had to remain submerged. Toi achieve this stone were inserted in the lower tumbi untill technology to knot was mastered.
This “stone+tumbi” came to eman “Achieved”
This activity also resulted in सम meaning equal as aligned inside (water level)