Nobody ever voluntarily uses it twice. A week later, I noticed the telltale fingernail striations of arsenic poisoning. Some of the folks flicking slow murder at a skinny, sickly-looking white boy were firing bank shots nearly thirty feet, rebounding shots that were all, or almost all, hitting the mark. Cliches come to my mind. Cliches may be old, or trite, but they have their value.
Cliches express complex thought in simple, common terms.
Not any sign language I know of, and my mother was deaf, and taught the deaf. I sign rather well, myself. Can't be that many spies in town. We're talking majority here. Perhaps there really are no ordinary people in the espionage business.