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Use "signaler" in a sentence
"Especially, I suspect, a signaler to law clerks who have just come off journals where obsessive BB compliance was expected, and are now exposed to a constant stream of briefs with random or incoherent citation formats."
"One lance corporal, a signaler who had not been assigned to advance, watched his friends try to cross, only, he said, to be “mown down like meadow grass.”"
"They effect a change in others: they may decrease social distance between the signaler and those around him, calling someone closer; or increase social distance, frightening someone away."