Everyone knows that a mouse is both a small rodent:
photo by Polarqueen at English Language Wikipedia
and a pointer device for a computer screen:
photo by Adarshjchandran
but did you know it also a (rare) slang term for a black eye, as well as being way of securing a shackle to prevent a load from slipping off it (it's a term used on a ship)?
I found this illustration HERE.
If you have none of these sorts of mice in view, then a human mouse will be a quiet, timid or perhaps cowardly person, a term usually applied to a woman.
Actually, now I come to think about it, to old women...
...well, that means the women of the world must be making some progress, then.
Spot the Frippet: mouse. This word comes from the Old English mūs. The Greek word was exactly the same - but then mice have long been great travellers.