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1. A child's coin bank shaped like a pig.
2. A reserve of money; savings: "Washington is slipping back into one of its intermittent debates about whether it is time to raid the national piggy bank" (Matthew Wald).
(Banking & Finance) a child's coin bank shaped like a pig with a slot for coins
a small bank, usu. having the shape of a pig, provided with a slot to receive coins.