The term 'thoroughly search' can be summed up by the crossword solution 'RANSACK, ' which is a seven-letter word. RANSACK means to search through something thoroughly and often in a destructive manner. It is derived from the Old Norse word rannsaka, which means to search or examine. The term is often used to describe a thorough search of a place or object, such as a house or vehicle. In some cases, it can also refer to a search for information or evidence.