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To take on the role or responsibilities of a grandmother, either literally or figuratively.
虽然她还年轻，但她已经开始当奶奶了。
Though she is still young, she has already started acting as a grandmother.
他当奶奶当得很认真，照顾孙子就像照顾自己的孩子一样。
He takes his role as a grandfather very seriously, caring for his grandson as if he were his own child.
This phrase is often used to describe someone who is not biologically a grandmother but takes on the role, such as a step-grandmother or a close family friend.
This phrase is often used in family or social contexts to describe someone who takes on the role of a grandmother, whether literally or figuratively.
Derived from the verb '当' (to act as) combined with '奶奶' (grandmother), indicating the act of taking on the role of a grandmother.
This phrase is commonly used in both literal and figurative contexts. It can refer to someone who is not biologically a grandmother but takes on the role, or it can be used humorously to describe someone who is overly nurturing or maternal.