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Longman Dictionary of Contemporary English
frighteners
noun
EXAMPLES FROM CORPUS
▪ But the bookie was already out hiring frighteners and the bet had to stand.
▪ Then she tries to reason with the frighteners through the door.
▪ Why should this female start putting the frighteners on him now, after all this time?
Wiktionary
frighteners

n. (plural of frightener English)

Usage examples of "frighteners".

But the bookie was already out hiring frighteners and the bet had to stand.

Much morp likely that he thought he could put the frighteners quite easily on a paralysed old man and an unworldly woman, and was currently underestimating both the princess’s courage and her husband’s inflexible honour.