Wrong. A couple is two exactly.
After the wedding: Oh look at the happy couple.
There aren't 3 or 4 people standing there, 2 people are standing there.
A couple.
To couple train carriages together means to attach two carriages together. There are more carriages behind that one, but they were all individually coupled together.
I need hearing aids. My aids are so small they fit completely in my ear, so unless you are standing up close, you can't see they are in.
I've had them for about 3 years and I'm still blown away how small they are and how well they help me.
The Guinness Book of World Records is in the Guinness Book of World Records itself, for being the book most stolen from libraries.