SEARCH through or examine something, especially methodically The explanations of the other words and phrases:-Set out: BEGIN a journeyLook up: search for and find a PIECE of information in a book or databaseImagine: FORM a mental image or concept ofThis question tests your concept and knowledge of phrasal verbs.A phrasal verb is a combination of words (a verb + a preposition or verb +adverb) that when used TOGETHER, usually take on a different meaning to that of the original verb. For eg. Run into, Pick up, Turn on etc.