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 - 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 - 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
adverb - inside a body, object, or structure; within rather than on the outside; within a company, system, or organization rather than from outside sources
verb - to offer sexual services, usually for money
verb, formal - to ask someone for money, help, information, or support in a serious or formal way
verb - to cause two or more things to happen at the same time or to operate together in the same rhythm or speed
noun - a soft, wet, shapeless mass produced by crushing or grinding something