corrupt (self), defile, destroy

Strong’s Dictionary of Greek Words:

Number:
5351 (find all occurrences in KJV Bible)
Greek:
φθείρω
Transliteration:
phtheiro
Phonic:
fthi’-ro
Meaning:
probably strengthened from φθίω (to pine or waste); properly, to shrivel or wither, i.e. to spoil (by any process) or (generally) to ruin (especially figuratively, by moral influences, to deprave)
KJV Usage:
corrupt (self), defile, destroy