pill
I
 /ˈpıl/  noun  ,  pl   pills [  count  ]
  1 a : a small, rounded object that you swallow and that contains medicine, vitamins, etc.
   She took a pill for her headache.
   The drug is available as a pill or a liquid.
   diet pills
  — see also pep pill, poison pill, sleeping pill, sugar pill
  1 b the pill : a pill that a woman takes so that she will not become pregnant : a contraceptive in pill form
   She is on the pill. [=she is taking birth control pills regularly]
  — see also morning-after pill
  2 US, informal : an annoying person
  — usually singular
   Don't be such a pill.
  (a) bitter pill (to swallow) — see bitter, 1
  sugar/sweeten the pill
   : to make an unpleasant thing less difficult to accept or deal with
    Faster service may sugar the pill of higher fees.
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II
  verb  , pills, pilled, pill·ing [  no obj  ]
   of a sweater, fabric, etc.   : to begin to have small balls of fiber on the surface usually after having been worn or used many times
   Wool sweaters may pill after you wash them.