suit up in English dictionary suit up Meanings and definitions of "suit up" (intransitive) To don a protective suit, such as a spacesuit. (transitive) To clothe, to put clothes on (someone). verb (intransitive) To don a suit, such as a spacesuit or a formal suit. verb (transitive) To clothe, to put clothes on (someone). more Grammar and declension of suit up suit up ( third-person singular simple present suits up, present participle suiting up, simple past and past participle suited up) suit up (third-person singular simple present suits up, present participle suiting up, simple past and past participle suited up) more Sample sentences with "suit up" Declension Stem Match words all exact any Try again Available translations German Hungarian Spanish Authors