unkeyword

UNKEYWORD  -  remove keywords from messages

Usage:  UNKEYWORD keyword-name [message-sequence]
  Unless specified, the message-sequence is "current".

The UNKEYWORD command removes a keyword from a message.  When a message 
  has no more KEYWORDS associated with it, the K indicator in the
  headers and the "keywords" header field in the message are removed.

To find out what keywords have been defined, type "keyword ?".  To see
  what keywords a message has, TYPE or READ the message; if it has any,
  you will see a header field "keywords" that lists them.

Example:
    MM>unkeyword bird 16	#removes keyword "bird" from message 16
    MM>unkeyword * 16           #removes all keywords from message 16

For more help type "help" and one of these topics:
  keyword   set keywords   message-sequence   headers   message-tagging