They have sharpened
shanan (shaw-nan')
to point (transitive or intransitive); intensively, to pierce; figuratively, to inculcate -- prick, sharp(-en), teach diligently, whet.
their tongues
lashown (law-shone')
the tongue (of man or animals), used literally (as the instrument of licking, eating, or speech), and figuratively (speech, an ingot, a fork of flame, a cove of water)
like a serpent
nachash (naw-khawsh')
a snake (from its hiss) -- serpent.
adders'
`akshuwb (ak-shoob')
an asp (from lurking coiled up) -- adder.
poison
chemah (khay-maw')
heat; figuratively, anger, poison (from its fever) -- anger, bottles, hot displeasure, furious(-ly, -ry), heat, indignation, poison, rage, wrath(-ful).
is under their lips
saphah (saw-faw')
the lip (as a natural boundary); by implication, language; by analogy, a margin (of a vessel, water, cloth, etc.)
Selah
celah (seh'-law)
suspension (of music), i.e. pause -- Selah.