Final answer:
The phrase commonly used to help consumers and retailers decide when food is of best quality is 'best if used by'. It indicates the peak quality until a specified date, but it does not mean the food is unsafe after that.
Step-by-step explanation:
Best if used by is a phrase commonly used to help consumers and retailers decide when food is of best quality. It is typically found on food products with a longer shelf life, such as canned and packaged goods. This phrase indicates that the product is at its peak quality until the specified date, but it does not mean that the food is unsafe to consume after that date.
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