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It is difficult to say with any precision.
Answer 1. Given that birds have to flap their wings to fly, in 'tent' terminology, there is what is called a 'fly', an extra outer layer, or a stand-alone sheet, which flaps about in the wind! In turn it seems that this word was used to describe 'fly-front pants', meaning flap-fronted pants.
There were various type of front openings of pants, most now having a vertical opening, which were originally fastened with buttons covered with a flap or fly. In due course the zip was invented, and is commonly used now as an alternative to buttons. The zip may still be covered with a fly or flap, but not necessarily.
Before the vertical opening became common, fall-fronted pants were commonly worn, where the flap opened downwards from the top.
In both cases, whether the opening was vertical or 'horizontal', the fact that there was always a flap to some extent may have contributed to the adoption of the word 'fly' (short for fly-fronted) to mean the entire front opening of a pair of pants/trousers.
Answer 2. Fly can also mean 'quick/quickly'. e.g 'He flew into a rage!' = he got angry very quickly. 'Time flies,' etc. So perhaps the fly opening is a quick opening in a pair of pants, rather than going through the rigmarole of unfastening one's belt and pulling down much of the garment in order, in the case of men, just to urinate.
What else can I help you with?
Why is a pants fly called a fly?
The term "fly" for the opening in pants originated from sailors in the 19th century, who referred to the fastening flap on their breeches as a "fly." This was likely due to the idea that the flap opened and closed like the wings of a fly.
What is the Noun of verb fly?
The plural form for the noun fly is flies.
What is a French fly in pants?
the fly in pants is called 'la braguette' in French.
Is flying an abstract noun?
No, the gerund 'flying' is a concrete noun, a word for a physical activity.
I need to know how much a labeled 1999 copper button fly 501 Levi is worth?
They were marketed when the miners found out about the sturdy pair of pants they might be able to get if they had 22 cents. They were marketed when the miners found out about the sturdy pair of pants they might be able to get if they had 22 cents.
Is flyfishing one word?
Yes, the word 'flys' is the plural form of the noun 'fly' as a word for the opening of a pair of pants. The plural form of the noun 'fly' as a word for a type of insect is flies. Example: Look at all the flies on the ceiling. The third person, singular, present of the verb to fly is also flies. Example: She flies to Africa every year.
What is the point of a fly on pants?
The point of a 'fly' on pants is so that boys and men can urinate without pulling their pants down.
What is the second pair of wings on flies called?
The fly (in the order diptera) have only one pair of wings. They don't have two.
What could be a 3D visual for fly by the seat of your pants?
what could be a a 3Dvisual for fly by the seat of your v pants
Can pants fly?
yes
How do you fly on the moon?
Get a HUGE pair of pants and tie it between two trees. Get in and attach a large rocket and go really far back, then when it stops, you fly into space, just make sure u have a space suit. Then catch a ride on a satilite!
What type of insect is a black hard shell flying bug about 1 inch long?
The flying black insect with a hard shell is called a beetle. Beetles have a hard exoskeleton and a pair of forewings called elytra. They have a second pair of wings called the alae or hind wings and this pair is what they use to fly.
