Use of &quot;bug&quot; to mean &quot;defect&quot; goes back a lot further than the computer age:<p><a href="http:&#x2F;&#x2F;www.etymonline.com&#x2F;index.php?term=bug&amp;allowed_in_frame=0" rel="nofollow">http:&#x2F;&#x2F;www.etymonline.com&#x2F;index.php?term=bug&amp;allowed_in_fram...</a><p>At the time of Grace Hopper, the term was used in engineering contexts to refer to defects in general, quite unrelated to insects.  Per your link, that&#x27;s <i>why</i> she wrote &quot;first actual case of a bug being found&quot; -- it was amusing and unusual to find a bug (defect) caused by a bug (insect).  If this were not the case, there would be no need to use the words &quot;first&quot; or &quot;actual&quot;, or even note the event.