May they be like a slug that melts away as it moves along, like a stillborn child that never sees the sun.
NIV
Let them be as a snail dissolving slime as it passes on or as a festering sore which wastes away, like [the child to which] a woman gives untimely birth that has not seen the sun.
AMP
As a snail which melteth, let every one of them pass away: like the untimely birth of a woman, that they may not see the sun.
KJV