miscarriage

miscarriage
noun

the expulsion of a fetus from the womb before it is able to survive independently, especially spontaneously or as the result of accident
流产
his wife had a miscarriage.
他的妻子流产了。
[mass noun]some pregnancies result in miscarriage.
有些怀孕会流产。
an unsuccessful outcome of something planned
（计划等的）失败，流产
the miscarriage of the project.
项目的失败。