underline Definition in the Cambridge English Dictionary
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Definition of “underline” - English Dictionary

Definition of "underline" - American English Dictionary

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underlineverb [T]

 us   /ˈʌn·dərˌlɑɪn/
to ​draw a ​line under a word: to underline ​significantparts of a ​text To underline is also to ​emphasize: The ​announcement underlines IBM’s ​newfoundwillingness to ​employtechnologiesdeveloped by other ​companies.
(Definition of underline from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "underline" - British English Dictionary

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underlineverb [T]

uk   /ˌʌn.dəˈlaɪn/  us   /-dɚ-/ (also underscore)
B1 to ​draw a ​line under a word, ​especially in ​order to show ​itsimportance: All the ​technical words have been underlined inred.B2 to ​emphasize: She gave some ​shockingexamples to underline the ​seriousness of the ​situation. To underline ​theirdisgust, the ​crowdstartedthrowingbottles at the ​stage.
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(Definition of underline from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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