Etymology
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show-off (n.)

1776, "a display;" see show (v.) + off (adv.). From 1801 as "a deliberate and ostentatious display;" in reference to the person who makes such a display, attested from 1924. The verbal phrase is first recorded 1793 as "make a conspicuous and obvious display." Noun showing-off is from 1874.

updated on October 10, 2017

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Definitions of show-off from WordNet

show-off (n.)
someone who deliberately behaves in such a way as to attract attention;
Synonyms: exhibitionist
From wordnet.princeton.edu, not affiliated with etymonline.