Here are the answers:
1) “Lose your bottle” – If someone loses their bottle, they lose the courage to do
something.
2) “Sound as a pound” – If something is as sound as a pound, it is very good or reliable.
3) “Talking the hind legs off a donkey” – Talk too much
4) “Throw a cat among the pigeons” – This metaphor paints a pretty clear picture; it means to say or do something that will cause a chaotic disturbance among a group.
5) “Back to Blighty” – Back to Britain
6) “As snug as a bug (in a rug)” – Very cosy
7) “Cat’s pyjamas” – A highly sought-after and fancy example of something, usually referring to inanimate objects.
8) “Donkey’s years” – Long time