Definition of fog signal in English:

fog signal

Line breaks: fog sig¦nal

Entry from British & World English dictionary

noun

A small explosive charge which can be placed on a railway line in fog to be set off by the train as a signal to the driver.

Definition of fog signal in:

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Word of the day demoralize
Pronunciation: dəˈmôrəˌlīz
verb
cause (someone) to lose confidence or hope; dispirit