wet nurse
US /ˈwet nɜːrs/
UK /ˈwet nɜːrs/

1.
a woman who breastfeeds and cares for another's child
:
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In some cultures, it was common for wealthy families to employ a wet nurse.
•
The baby thrived under the care of the kind wet nurse.
1.
to breastfeed and care for another's child
:
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She agreed to wet nurse her sister's baby while her sister recovered.
•
It was a common practice in the past to wet nurse children from other families.