This sounds like you might be referring to the Korean word "geuman" 그만
This means "stop" or to "end" something. In Taekwondo competition, it is used by the center referee to indicate that time is up for a round of sparring. It is also used at the completion of performing a pattern or form to signal for the student to go back to the "junbi" (ready) position. In general, it may be used at any time by an instructor to call a cease to all activities, whereby students should immediately stop what they are doing.
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