To disturb or make someone feel worried or nervous about something.
Originally from the word 'feaze' or 'faze' in Middle English, possibly from Old English 'fesian' meaning to drive out or expel. The modern sense of 'to disturb mentally' developed in American English by the 19th century.
The phrase 'nothing fazes me' became popular in the early 1900s, and it's interesting that this word almost disappeared from English but was brought back by American writers who needed a simple word for emotional disturbance that didn't rely on Latinate roots.
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