adjective - working secretly, especially as a police officer trying to get information without people knowing who you really are
noun - the place where a crime happened and where the police look for clues and evidence
noun - a male reproductive cell that can join with a female egg to create a new life
noun - an animal or human in the early stages of development before birth, especially before all the main body parts are formed
noun - an organ that develops in the uterus during pregnancy to provide oxygen and nutrients to the developing baby and remove waste products from the baby's blood
adjective - not allowed or not suitable to do something or receive something, especially by law or by rules
noun, formal - the set of reasons or logical basis for a course of action or belief
adverb - in a way that increases very rapidly and by a growing rate
adjective - increasing very rapidly by large amounts
verb, informal - to dress yourself in fancy or stylish clothes, especially for a special occasion