student asking question

What does "duty" mean here? It seems like it is used as unusual meaning.

teacher

Native speaker’s answer

Rebecca

"Heavy-duty" (or more commonly, "heavy-duty") is actually a full expression, which in this context has been used to mean "intensive" or "demanding." Thus, we can understand "heavy duty" in this video to mean that the dishwasher is capable of intensive cleaning. In other situations, "heavy duty" may be used to mean something designed to withstand intensive use or heavy strain. Ex: I am planning to do heavy-duty cleaning of my kitchen. Ex: This vacuum cleaner is perfect for heavy-duty use.

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