Definitions from Wiktionary ( )

▸ noun:  A small horse; a pony.
▸ noun:  An old, useless horse.
▸ noun:  (obsolete, derogatory) A paramour.
▸ verb:  (ambitransitive) To repeatedly remind or complain to (someone) in an annoying way, often about insignificant or unnecessary matters.
▸ verb:  To bother with persistent thoughts or memories.
▸ verb:  To bother or disturb persistently in any way.
▸ noun:  Someone or something that nags.
▸ noun:  A repeated complaint or reminder.
▸ noun:  A persistent, bothersome thought or worry.
▸ noun:  Misspelling of knack. [A readiness in performance; aptness at doing something.]

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