| They block signals from the brain to the muscles. | มันกั้นสัญญานที่ ส่งจากสมองไปยังกล้ามเนื้อ The Uncanny Valley (2010) |
| Block signal | . (Railroads) One of the danger signals or safety signals which guide the movement of trains in a block system. The signal is often so coupled with a switch that act of opening or closing the switch operates the signal also. [ Webster 1913 Suppl. ] |