The word 'cheek' has undergone a notable semantic narrowing over its long history in English. It descends from Old English 'cēce' or 'cēace,' from Proto-Germanic *kaukō (jaw, cheek), and in its earliest English uses it could refer to the jawbone, the jaw, or the fleshy side of the face. This broader meaning survives in the cognate languages: Dutch 'kaak' means 'jaw' or 'jawbone,' Norwegian 'kjake' means 'jaw,' and Swedish 'käke' means 'jaw.' English narrowed the meaning to the soft, fleshy area between the nose and the ear, below the eye.
The deeper etymology of Proto-Germanic *kaukō is uncertain. One proposal connects it to a root meaning 'to chew,' which would make the cheek 'the chewing-part' of the face — the area that moves visibly during mastication. This is phonologically possible but not firmly established. The word has no clear cognates outside the Germanic family (
The Old English form 'cēace' shows the same palatalization of initial /k/ to /tʃ/ that affected 'chin' (from 'cin'), 'child' (from 'cild'), and 'cheese' (from 'cēse'). This sound change, which occurred before front vowels, is one of the signature developments that distinguishes English from the other West Germanic languages.
The slang use of 'cheek' to mean 'impudence, audacity, boldness' appeared in British English in the nineteenth century. 'What cheek!' (how audacious!) and 'cheeky' (boldly impudent) are attested from the 1840s and 1850s respectively. The origin of this figurative sense is debated. It may come from the association of the cheek with speech — talking 'out of the side of one's face,' speaking
The expression 'turn the other cheek' — to respond to aggression with non-retaliation — comes from the Sermon on the Mount (Matthew 5:39). It has become one of the most recognized phrases in the English language and is used both literally (as a Christian ethical teaching) and figuratively (as a general policy of non-retaliation). 'Tongue-in-cheek' (not meant to be taken seriously) dates from the 1830s, from the physical gesture of pressing one's tongue against the inside of the cheek to suppress a smile or signal irony.
'Cheekbone' (the zygomatic bone) is a straightforward compound. The cheeks are among the most socially significant parts of the human face — blushing (reddening of the cheeks) is an involuntary social signal unique to humans, and cheek-kissing as a greeting is practiced across dozens of cultures, from France to the Middle East to Latin America.