block signal
(railways) One of the danger signals or safety signals which guide the movement of trains in a block system, often coupled with a switch so that opening or closing the switch also operates the signal.
present participle of rehem
(poetry) A metre with alternate lines of 12 and 14 syllables.
(grammar) A multi-word verb, consisting of a verb followed by an adverbial particle and a preposition, that has idiomatic meaning.
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