What is the meaning of Mark 9:18?

* The two F.O.G. Bibles & Commentary below are currently a work in progress.

Whenever it seizes him, it throws him to the ground. He foams at the mouth, gnashes his teeth, and becomes rigid. I asked Your disciples to drive it out, but they were unable.”

Berean Standard Bible (BSB)

and wherever it seizes him, it throws him down, and he foams at the mouth, and grinds his teeth, and wastes away. I asked your disciples to cast it out, and they weren’t able.”

World English Bible (WEB)

And{G2532} wheresoever{G3699}{G302} he taketh{G2638}{(G5632)} him{G846}, he teareth{G4486}{(G5719)} him{G846}: and{G2532} he foameth{G875}{(G5719)}, and{G2532} gnasheth{G5149}{(G5719)} with his{G846} teeth{G3599}, and{G2532} pineth away{G3583}{(G5743)}: and{G2532} I spake{G2036}{(G5627)} to thy{G4675} disciples{G3101} that{G2443} they should cast{G1544} him{G846} out{G1544}{(G5632)}; and{G2532} they could{G2480}{(G5656)} not{G3756}.

Strong's King James

(18) Wherever it finds him, it tears him and he foams and grinds teeth and withers away. I told Your disciples to expel it and they had no power.

The F.O.G*

[18] Whenever it seizes him, it violently throws him down. He foams at the mouth, grinds his teeth in agony, and his body becomes rigid. I begged Your disciples to drive it out, but they couldn't help us."

The F.O.G Paraphrase

and wherever it doth seize him, it doth tear him, and he foameth, and gnasheth his teeth, and pineth away; and I spake to thy disciples that they may cast it out, and they were not able.’

Young's Literal Translation