From nagaph; a trip (of the foot); figuratively, an infliction (of disease) -- plague, stumbling.
see HEBREW nagaph
H5063. negeph
נֶ֫גֶף noun masculineExodus 12:13 blow, striking (as judgment, only P); — ׳נ absolute 12:13 6t.; —
1 fatal blow, plague, Exodus 12:13 (death of first-born); 30:12; Numbers 8:19 (indefinite); = pestilence 17:11; 17:12; Joshua 22:17.
2 striking, נ ׳אֶבֶן Isaiah 8:14 i.e. against which the foot strikes and so stumbles ("" מִכְשׁוֺל צוּר).