Why did it suddenly stop cutting?
Please provide the model of your machine.
Ok, it's a serger. Wondered why a sewing machine would be cutting unless it had the cut-n-sew accessory.
Most likely the blades are damaged or malfunctioning. Is the blade still moving when it is stitching? Is it just chomping away at the fabric but not cutting? If so, either or both blades need to be replaced. Consult your owner's manual. Usually only one blade can be installed without any technical knowledge. You can probably order the replacement blade and install it yourself. However, the other usually needs to be replaced by a knowledgeable technician because it requires some precision.
Has the blade stopped moving at all? If so, how long has it been since a thorough cleaning and oiling? Take it for service.
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