stick to knitting
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stick to (one's) knitting
1. To mind one's own business. Oh, stick to your knitting—I don't need to hear your opinion of every little thing I do.
2. To do only what one knows or is familiar with. You can't just stick to your knitting—you have to try new things too.
stick to (one's) knittingInformal
To mind one's own business.