Among London cabbies, a musher is somebody who owns their own cab, a starving musher is someone still paying for their cab, and musher’s lotion is rain. The book Schott’s Significa: A Miscellany of Secret Languages (Bookshop|Amazon), writer Ben...
Centuries ago, monks who took a vow of silence still had to communicate about everyday activities in the monastery, from gardening to equipment repair. So they developed their own hand signs, with hundreds of gestures for various words and ideas...
tick-tacker n. at a horse track, a person (often a tout) who communicates information to others by hand signals. (source: Double-Tongued Dictionary)