Merriam-Webster Collegiate Dictionary - skulk

 I. intransitive verb  Etymology: Middle English, of Scandinavian origin; akin to Norwegian dialect ~a to lie in wait, lurk  Date: 13th century  1. to move in a stealthy or furtive manner ~ed into her sister's room  2.  a. to hide or conceal something (as oneself) often out of cowardice or fear or with sinister intent  b. chiefly British malinger  Synonyms: see lurk  • ~er noun  II. noun  Date: 14th century  1. one that ~s  2. a group of foxes