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Wiktionary
money box

n. A tin with a slot in the top for depositing coins, used by children to save.

WordNet
money box
  1. n. a container (usually with a slot in the top) for keeping money at home; "the coin bank was empty" [syn: savings bank, coin bank, bank]

  2. a strongbox for holding cash [syn: cashbox, till]

Wikipedia
Money Box (radio)

Money Box is a weekly personal finance radio programme on BBC Radio 4.