Oxford Dictionary English speak up phrasal verbphrasal verb Add to my wordlistjump to other resultsPhrasal Verbs speak up Add to my wordlistjump to other results usually used in orders to tell somebody to speak more loudly Please speak up—we can't hear you at the back. speak up (for somebody/something) Add to my wordlistjump to other results to say what you think clearly and freely, especially in order to support or defend somebody/something oxfordlearnersdictionaries.com