From Longman Dictionary of Contemporary Englishwhinnywhin‧ny /ˈwɪni/ verb (whinnied, whinnying, whinnies) [intransitive] HBACif a horse whinnies, it makes a high sound → neigh —whinny noun [countable]→ See Verb table
Examples from the Corpus
whinny• I heard the animals whinny and stamp.• Gleeson gave a brief, whinnying giggle.• Kings and sheep and whinnying horses and Serving maids and beggar boys gathered together in the frosty imagined night.• Tod's glands are in their dream mode, whinnying in nightmare.• A horse skidded on ice, whinnying loudly as it fell to its side.• He concluded that the horses were whinnying to him through affection.Origin whinny (1500-1600) From the sound 