Meaning of “underscore” in the English Dictionary

"underscore" in American English

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underscoreverb [ T ]

us /ˈʌn·dərˌskɔr, -ˌskoʊr/

to emphasize the importance something:

The need for fire detectors in cargo bays was underscored by some accidents in the 1980s.

(Definition of “underscore” from the Cambridge Academic Content Dictionary © Cambridge University Press)