piggy bank . piggy bank {n.} A small bank, sometimes in the shape of a pig, for saving coins. John's father gave him a piggy bank. Categories: add yours {n.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: P Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Comment on this entry