The term 'Look Through a Keyhole' can be summarized by three crossword solutions: SPY (3 letters), PEER (4 letters), and PEERIN (6 letters). SPY is a person who secretly observes others, usually for the purpose of gathering information. PEER is to look closely or intently at something, often with the intention of discovering something. PEERIN is an archaic term meaning to look through a keyhole. All three words refer to the act of looking closely at something in order to gain knowledge or information.