Show fear is an emotion that is often expressed through physical cues. PALE is a four letter word that can be used to describe someone's complexion when they are scared, TREMBLE is a seven letter word that describes the shaking of someone's body when they are afraid, COWER is a five letter word that describes someone shrinking away from something that frightens them, START is a five letter word that describes the sudden movement someone makes when they are startled, QUAKE is a five letter word that describes the trembling of the ground when someone is scared, and CHICKENOUT is a ten letter word that describes someone backing out of something because they are too scared to do it.