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mommy track

n. (context informal English) A career path involving working arrangements provided for mothers and prospective mothers, generally more flexible and allowing shorter hours. Compare fast track.

Wikipedia
Mommy track

A mommy track is a path in a woman's life that puts priority to being a mother. It can also specifically refer to work arrangements for women in the workforce that facilitate motherhood, such as flexible hours, but at the same time usually provides fewer opportunities for career advancement. References to the mommy track often go along with being a housewife, "opting out" of the workforce, temporarily or even permanently. Women following the mommy track may be contrasted to career women who prioritize their careers more than having children.