The Northeast is so cold, the average temperature is -15, Yabuli, Snow Town and other places can reach -25, so down jackets are indispensable equipment. When getting dressed in the morning, I found an interesting English:
Look at this sentence: padded with genuine goose down(be) padded with means "fill"; genuine is an adjective, "true", and goose down means "goose down". goose means "goose" We all know that down most commonly means the preposition "below" (the antonym is up), why is it "velvet" when placed here? Let's look at the definition in the Oxford Dictionary:
Down means "the very fine soft feathers of a bird", which is "the very fine soft feathers of a bird", commonly known as "down". 
The dictionary also gives this meaning: from old Norse dúnn, from Old Norse dúnn. 
It seems that the Nordic people in the snow and ice have long figured out how to use down to keep warm. Since down for "down" comes from Old Norse, so down for "down" comes from **? 
The source of this superficial meaning in the dictionary is the Old English word dūn, which is an abbreviated form of adūne, meaning "downward." Speaking of which, I believe you have figured out why down means "down" and "down", right? There is another example of this situation:soleYou will find that it can be used as both an adjective to indicate "unique" and a noun to indicate "sole of the foot". This is because the word "sole" comes from the Latin word sola, which means "alone". And when it means "foot plate", it comes from the Latin word solum, which means bottom. You can understand this situation as,These are two words with different origins, but the spelling happens to be the same. Let's look at the second case: the extension of meaning. For example, moonlight can mean both "moonlight" and "part-time", and it feels like "eight poles can't hit a piece", but if you think about it carefully, it still belongs to the extension of the meaning of the word. The original meaning of moonlight is "moonlight", but part-time jobs are often done after work, and going out to do side jobs with stars and moons also has the meaning of not wanting to be known, that is, a profession to do secretly, that is, "moonlight occupation", for example: he is moonlighting as a cab driver(He also works part-time as a taxi driver). Therefore, the meaning of moonlight as a "part-time job" is derived from its original meaning of "moonlight". And one more: cancer, which can mean "cancer" or "Cancer". These two seemingly unrelated meanings are related, because their origins are in Greekkarkinos(Crab). 
It's easy to understand that Cancer originates from this, so why does cancer also originate from crabs? This is because ancient Greek doctors found that the malignant tumor was expanding like a crab, so they named it "karkinos". Later, the word was translated into Latin by the Romans, introduced into French, and finally into English, where it became cancer. To sum up, if a word has two completely different or even opposite meanings, the reasons may be:1.The source is different, but the spelling happens to be the same2.The two meanings are actually related, the second meaningIt is derived from the first meaning