freak

1. any abnormal phenomenon or product or unusual object; anomaly; aberration.
2. a person or animal on exhibition as an example of a strange deviation from nature.
3. a sudden and apparently causeless change or turn of events, the mind, etc.; an apparently capricious notion, occurrence, etc.:

   That kind of sudden storm is a freak.

   Synonyms: crotchet, quirk, vagary

4. Numismatics. an imperfect coin, undetected at the mint and put into circulation.
5. Philately. a stamp differing from others of the same printing because of creases, dirty engraving plates, etc. Compare error ( def 8 ), variety ( def 7 ).
6. Slang.
   1. a person who has withdrawn from normal, rational behavior and activities to pursue one interest or obsession:

      a drug freak.

   2. a devoted fan or follower; enthusiast:

      a baseball freak.

   3. a hippie.
7. Archaic. capriciousness; whimsicality.

1. unusual; odd; irregular:

   a freak epidemic.

1. to become or to make (someone) insane or out of control, as a result of being frightened, wildly excited, or high on drugs: The loud noise freaked the horses just as they were being loaded into trailers.

   Mom'll freak if she ever finds out we threw that party when she was out of town.

   The loud noise freaked the horses just as they were being loaded into trailers.

verb phrase

1. Slang. freakout.

1. to fleck, streak, or variegate:

   great splashes of color freaking the sky.

1. a fleck or streak of color.