fog-signal
Definition
Noun: A device used as a warning signal in foggy conditions, especially on railways. It typically consists of a small explosive charge placed on the track to alert train drivers of danger ahead.
Usage Examples
- (A warning device for trains in low visibility.)
- (Safety devices used during fog.)
- (The sound produced by the warning device.)
Advanced Usage
"to set a fog-signal": to place a warning device on the railway track.
- The signalman set a fog-signal at the crossing during heavy fog. (He placed the explosive warning device.)
"fog-signal detonation": the explosion of the device to produce the warning sound.
- The fog-signal detonation was heard miles away in the thick fog. (The explosion of the warning device.)
Variants and Related Words
Fog-signalling (noun): the practice or system of using fog-signals.
- Fog-signalling was a critical safety measure before modern electronic systems. (The use of fog-signals on railways.)
Fog-signal box (noun): a container or holder for storing fog-signals.
- The worker carried a fog-signal box with several charges. (A box for storing the warning devices.)
Synonyms
- Explosive warning device: a device that uses an explosion to give a warning.
- Railway fog signal: a specific term for fog-signals used on railway tracks.
Related Idioms
- "like a fog-signal": (rare) used metaphorically to describe something that provides a sudden, clear warning.
- His warning came like a fog-signal, sharp and unmistakable. (A clear and urgent warning.)