STRONGS G4417:
													
												
									    		πταίω; future 
πταίσω; 1 aorist 
ἐπταισα; (akin to 
ΠΑΤΩ and 
πίπτω (cf. 
Vanicek, p. 466)); from (
Pindar), 
Aeschylus, and 
Herodotus down; 
1. transitive, 
τινα, 
to cause one to stumble or fall. 
2. intransitive, 
to stumble: 
δίς πρός τόν αὐτόν λίθον, 
Polybius 31, 19, 5. tropically (cf. English 
trip, stumble) 
a. to err, to make a mistake (
Plato, Theact c. 15, p. 160 d.); 
to sin: absolutely 
Romans 11:11 (
ἴδιον ἀνθρώπου φιλεῖν καί τούς πταιοντας, 
Antoninus 7, 22); 
πολλά, in many ways, 
James 3:2; 
ἐν ἑνί (namely, 
νόμῳ), 
to stumble in, i. e. sin against, one law, 
James 2:10 (but see 
εἷς, 2 a. at the end); 
ἐν λόγῳ (for the (more common) simple dative), to sin in word or speech, 
James 3:2. 
b. to fall into misery, become wretched (often so in Greek writings): of the loss of salvation, 
2 Peter 1:10. 
    THAYER’S GREEK LEXICON, Electronic Database.
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