Disallow

/ˌdɪsəˈlaʊ/ verb

To refuse to permit or approve something; to reject as invalid or unacceptable.

Formed by adding the prefix 'dis-' (meaning 'not' or 'opposite of') to 'allow'. The word 'allow' comes from Old French 'alouer', meaning 'to approve or praise'. The combination creates a word meaning 'to not allow' or 'to prohibit'.

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