Merriam-Webster Collegiate Dictionary - shut

 I. verb  (~; ~ting)  Etymology: Middle English shetten, ~ten, from Old English scyttan; akin to Middle Dutch schutten to ~ in, Old English sceotan to shoot — more at shoot  Date: before 12th century  transitive verb  1.  a. to move into position to close an opening ~ the lid  b. to prevent entrance to or passage to or from  2. to confine by or as if by enclosure ~ herself in her study  3. to fasten with a lock or bolt  4. to close by bringing enclosing or covering parts together ~ the eyes  5. to cause to cease or suspend an operation or activity — often used with down  intransitive verb  1. to close itself or become closed flowers that ~ at night  2. to cease or suspend an operation or activity — often used with down  II. adjective  Date: 15th century  1. closed, fastened, or folded together  2. rid, clear, free — usually used with of  III. noun  Date: 1667 the act of ~ting