crimsonPronunciation: /ˈkrɪmz(ə)n/Translate crimson | into French | into German | into Italian | into Spanish Definition of crimson adjective of a rich deep red colour inclining to purple:she blushed crimson with embarrassment noun [mass noun] a rich deep red colour inclining to purple: a pair of corduroy trousers in livid crimson, they were horrid to behold verb [no object] (of a person’s face) become flushed, especially through embarrassment:my face crimsoned and my hands began to shakeOrigin: late Middle English: from obsolete French cramoisin or Old Spanish cremesin, based on Arabic qirmizī, from qirmiz (see kermes). Compare with carminecrimson in other Oxford dictionaries Definition of crimson in the US English dictionary