From Longman Dictionary of Contemporary Englishpiggy-bankˈpiggy-bank noun [countable] 
DHa small container, usually in the shape of a pig, in which children can save coins
DHa small container, usually in the shape of a pig, in which children can save coinsExamples from the Corpus
piggy-bank• He puts part of his pay into a spending account and the rest into a piggy-bank.• At £110 Alfonzo is beyond most piggy-banks, so look on him more as an investment than a bedfellow. 