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
adjective - feeling quietly sad or thoughtful, often for no clear reason
noun - thin, flexible wire netting with small hexagonal holes, used especially for making fences around areas where chickens or other small animals are kept
noun, formal - something that is an unfair or unreasonable burden or inconvenience to someone
noun - the act of forcing people to accept something such as a rule, law, tax, or belief
verb, British English, informal - to spit