|Noah Webster's Dictionary|
1. (v. i.) To utter the cry of the horse; to whinny.
2. (v. i.) To scoff or sneer; to jeer.
3. (n.) The cry of a horse; a whinny.
Int. Standard Bible Encyclopedia
na (tsahal, "to cry aloud," "neigh"): Figuratively used to indicate lustful desire (Jeremiah 5:8; compare Jeremiah 13:29).
Neigh (2 Occurrences)
Jeremiah 5:8 They were as fed horses roaming at large; everyone neighed after his neighbor's wife. (Root in WEB KJV JPS ASV BBE DBY WBS YLT NAS RSV NIV)
Jeremiah 50:11 Because you are glad, because you rejoice, O you who plunder my heritage, because you are wanton as a heifer that treads out the grain, and neigh as strong horses; (WEB JPS ASV DBY NAS RSV NIV)