unflag

UNFLAG  -  remove the F indicator from the current message

Usage:  UNFLAG 

The UNFLAG command removes the F indicator from the header line of the
  current message.  The F indicator shows that you used the FLAG command
  to mark the message as important.  Use UNFLAG to remove the FLAG.

Example:
    MM>read flagged
    ...flagged message is displayed...
    Read>unflag   			#to remove the flag

For more help type "help" and one of these topics:
  flag   headers   message-tagging