labor pains

noun
1.
pain encountered during the uterine contractions of childbirth.
2.
difficulties, problems, or setbacks encountered during the initial phase of a business or project.

Origin:
1745–55

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

labor pains pl.n.
Rhythmical uterine contractions that, under normal conditions, increase in intensity, frequency, and duration, and culminate in vaginal delivery of the infant.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Others are terrified of labor pains and complicated deliveries or want to avoid the wear and tear on their bodies.
Contraction, or labor pains are the tightening and relaxing of the muscles of the uterus.
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