They are joined one to another. They stick together, so that they can't be pulled apart.
KJV
They are joined one to another, they stick together, that they cannot be sundered.
Commentary
Commentary
They are joined one to another,.... One scale to another, or "a man in his brother" (h): which may seem to favour the notion of the whale's teeth in the sockets, which exactly answer to one another; but the next clause will by no means agree with them;
they stick together, that they cannot be sundered: whereas they easily be, at least by the creature itself; but the scales of a crocodile are so closely joined and sealed together, that there is no parting them.
(h) "vir in fratre suo"; Montanus.
Commentary
Commentary