STRONGS G4418:
													
												
									    		πτέρνα, 
πτέρνης, 
ἡ, 
the heel (of the foot): 
ἐπαίρειν τήν πτέρναν ἐπί τινα, 
to lift up the heel against one, i. e. dropping the figure (which is borrowed either from kicking, or from a wrestler tripping up his antagonist), 
to injure one by trickery, John 13:18 after 
Psalm 41:10 (
Ps. 41:9). (Often in Greek writings from 
Homer down; the 
Sept. for 
עָקֵב.) 
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