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不尽抚养义务的父亲/母亲 means:

不尽抚养义务的父亲/母亲

名词

full

deadbeat mom

noun

(informal) a mother, usually separated from the family, that refuses, or is behind, in paying for the support and care of her children

She was a deadbeat mom, having failed to pay $35,000 in child support.