nag

n. one who nags, pest; overworked and worn out horse; pony, small leisure horse

v. remind incessantly (especially of a chore); criticize relentlessly (of a fault or imperfection); pester; bother; be a persistent source of pain or nuisance

NAG can stand for:Dr. Babasaheb Ambedkar International Airport, Nagpur, India for its IATA codeThe Numerical Algorithms Group, Ltd.NAG Numerical LibrariesNeue Automobil GesellschaftN-AcetylglucosamineNew Age Gaming Magazine
See more at Wikipedia.org...

An english slang term for unhelpful reminders to complete an activity.Nag (Jungle Books), a male cobra in Rudyard Kipling's Rikki-Tikki-TaviNag (software), a multi user tasklist managerNew Age Gaming, a gaming magazine in South AfricaNew American Gospel, debut album by heavy metal band Lamb of GodN-Acetylglucosamine, a biological moleculeIndia's Nag Missile System, a third generation "fire and forget" anti-tank missileNag, a small horse; an old female horse; a pony.
See more at Wikipedia.org...

Noun
1. someone (especially a woman) who annoys people by constantly finding fault
(synonym) scold, scolder, nagger, common scold
(hypernym) unpleasant person, disagreeable person
(hyponym) harridan
(derivation) peck, hen-peck
2. an old or over-worked horse
(synonym) hack, jade, plug
(hypernym) horse, Equus caballus
Verb
1. bother persistently with trivial complaints; "She nags her husband all day long"
(synonym) peck, hen-peck
(hypernym) complain, kick, plain, sound off, quetch, kvetch
(derivation) scold, scolder, nagger, common scold
2. worry persistently; "nagging concerns and doubts"
(hypernym) worry, vex
3. remind or urge constantly; "she nagged to take a vacation"
(hypernym) remind

v. gnaw, nibble, bite, wear away, corrode

(v. t. & i.)
To tease in a petty way; to scold habitually; to annoy; to fret pertinaciously.
  

(n.)
A small horse; a pony; hence, any horse.
  

(n.)
A paramour; -- in contempt.