The term 'use-by' is a modern English compound word formed by combining 'use' and 'by' to indicate a deadline for consumption.

The concept of labeling products with a 'use-by' date emerged in the late 20th century as a response to consumer demand for food safety and quality assurance.

Initially, it was used to indicate the last date of optimal quality, but it has evolved to also imply safety concerns for perishable items.