verb (supplies, supplying, supplied)[with object]
noun (plural supplies)
late Middle English: from Old French soupleer, from Latin supplere 'fill up', from sub- 'from below' + plere 'fill'. The early sense of the noun was 'assistance, relief' (chiefly a Scots use)
If a word ends in a consonant plus -y (as in defy), change the -y to an -i before adding any ending (unless the ending already begins with an -i): (supplies, supplying, supplied).