A furtive glance is a quick, surreptitious look. It is often done in order to avoid being noticed or to hide something. The term can be broken down into three crossword solutions: LEER (4 letters), PEEK (4 letters), and PEEP (4 letters). LEER is an intense, sidelong look that is often used to express a feeling of suspicion or contempt. PEEK is a quick, often secretive look. PEEP is a brief, timid look. All three words are used to describe a furtive glance.