not know one is born en · X
Meanings
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(idiomatic, informal) To be spoiled; to have an easy life without appreciating it.
"The trouble with workers to-day," he said, "is that they don't know they're born."
1949, Punch, volume 217:"One bad night and you think you're starving! You don't know you're born!"
2013, Lisa Tuttle, Panther in Argyll: