Strong's Concordance

Original word: πταίω
Transliteration: ptaió
Definition (short): stumble
Definition (full): to cause to stumble, to stumble

NAS Exhaustive Concordance

Word Origin: a prim. word
Definition: to cause to stumble, to stumble
NASB Translation: stumble (4), stumbles (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

A form of pipto; to trip, i.e. (figuratively) to err, sin, fail (of salvation) -- fall, offend, stumble.

see GREEK pipto

KJV: I say then, Have they stumbled that they should fall? God forbid: but rather through their fall salvation is come unto the Gentiles, for to provoke them to jealousy.
NASB: I say then, they did not stumble so as to fall, did they? May it never be! But by their transgression salvation has come to the Gentiles, to make them jealous.
KJV: For whosoever shall keep the whole law, and yet offend in one point, he is guilty of all.
NASB: For whoever keeps the whole law and yet stumbles in one point, he has become guilty of all.
KJV: For in many things we offend all. If any man offend not in word, the same is a perfect man, and able also to bridle the whole body.
NASB: For we all stumble in many ways. If anyone does not stumble in what he says, he is a perfect man, able to bridle the whole body as well.
KJV: Wherefore the rather, brethren, give diligence to make your calling and election sure: for if ye do these things, ye shall never fall:
NASB: Therefore, brethren, be all the more diligent to make certain about His calling and choosing you; for as long as you practice these things, you will never stumble;