According to a dictionary Tupperware is a company name and refers to their products.
In the daily conversation the word is used also for other company's plastic container? Or just for their products?
Answer
As a native English speaker, I use "Tupperware" for general plastic containers, not just for specifically Tupperware's products. In the same way, many people use "Kleenex" instead of "tissue" even though Kleenex is a brand name.
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