Verb · Apparently another form of πλάσσω (G4111) (through the idea of flattening out)
Apparently another form of G4111 (through the idea of flattening out); to pound, i.e. (figuratively) to inflict with (calamity):—smite. Compare G5180.
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Breakdown
Sun, moon and stars represent knowledge, wisdom and understanding. for a third part of it
On one level referring to Esau (the third part of men; the three classifications of men: The Sons of God (The Israelites), The Sons of Men (the heathen nations) and The Sons of The Wicked (The Edomites)). The Edomites will not have the knowledge, wisdom or understanding to get out of the destruction. On another level, the missiles will darken the sun, moon and stars.
Strongs concordance