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 - an unpleasant, harsh, or metallic ringing sound made by metal objects hitting each other
verb - to make a harsh, discordant, metallic sound, or to cause something to make such a sound
adjective - describing petrol that contains lead compounds
adjective - describing petrol that does not contain lead, which is less harmful to the environment and engines
noun, British English - a list of people showing when they are on duty, working, or taking part in an activity
noun - a list of members of a team, group, or organization
noun - a list of people showing when they are on duty, working, or taking part in an activity
noun - the ability to imagine or plan what will or might happen in the future and to prepare for it wisely
noun - careful thinking or planning about what might happen in the future, especially to avoid problems