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A Glasgow smile (also known as a Glasgow grin, Anna grin, Chelsea grin or Chelsea smile) is a nickname for the practice of cutting a victim's face from the edges of the mouth to the ears.
The cut – and the scars it leaves – form an "extension" of what resembles a smile.
Sometimes to further hurt or even kill the victim, he or she would then be stabbed or kicked, most notably in the stomach (or in case of kicking, the groin), so that the face would be ripped apart when the victim screamed.
The practice originated in the Scottish city of Glasgow, which gave it its name. It also became popular in Chelsea, London (where it is known as a "Chelsea grin") and other areas of Britain, for gangs hoping to leave a message to rival gang members. If cut deep enough, the victim may bleed to death.