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Let him do it because it's his baby.
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Don't push this job on me because it's your baby, not mine.
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This classic show car is his baby.
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Hey baby, how are you doing today?
I understand that the speaker used the word baby to describe work in the first and second examples. The 3rd example is confusing me. How can a car be one's work? Please help improve my understanding.
I know the slang word baby means "a woman who is young", as in the last example, someone is talking to a woman/girl.
Best Answer
You've slightly misinterpreted the word baby in your first three examples. It means something in which one has invested time, interest, and emotion and for which one has a proprietary feeling. Speaking hyperbolically, it's as though the object of interest is like one's own child.
I thought I should add an example of the usage that didn't involve work- or job-related situations. This turned out not to be as easy as I thought. There's even a canonical political cartoon, showing Hoover turning over the problems of the Depression to Roosevelt in 1933, captioned "It's his 'baby' now":
But I finally found a story about a man who as a hobby, salvaged his car that had been in an accident, replacing the metal body with one made entirely of wood. From that story:
A labor of love, with a play on the nine-month "gestation" period for the "baby."