The word "caesarean" (also spelled "cesarean") has two main uses in English. Let's break it down:
As an adjective: "Caesarean" means something that is related to Julius Caesar, the famous Roman leader. It can also refer to the method of delivery during childbirth.
As a noun: A "caesarean" (or "caesarean section") is a surgical procedure used to deliver a baby. In this procedure, doctors make an incision (a cut) in the mother’s abdomen and uterus to help the baby be born. This method is sometimes used when a vaginal birth is not possible or safe.
There are no specific idioms or phrasal verbs directly related to "caesarean." However, in discussions about childbirth, you might hear phrases like "go into labor," which refers to the process leading up to delivery (either vaginally or via caesarean).
"Caesarean" is a useful word to know, especially in medical contexts related to childbirth.