In older documents also tirelire (savings box, money-box; rainy day fund)

Small locked containers lent by banks and especially by savings banks to private households in former times (hence also: home safe), which were provided with a slot for inserting mainly coins and often also with a lock to prevent the money from being tipped out. The savings box could be emptied only in the issuing institution and was usually credited in the passbook. – Figuratively, savings especially for times of need (nest egg); a hoard. – See money jeans, cash box, savings deposits, piggy bank, savings interest.

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