Webster's English Dictionary

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ache

1. ache \'a-k\ vt [ME aken, fr. OE acan; akin to LG a:ken to hurt] 1a: to 
   suffer a usu. dull persistent pain  1b: to become distressed or disturbed 
   (as with anxiety or regret)  1c: to feel compassion  2: to become filled 
   with painful yearning 
2. ache n : a usu. dull persistent pain