try to answer the meaning of jargons....?

Question

1) fit like a fiddle....
2)key to pandora's box

Answer 1

1. sound and energetic
2. calamitous

Answer 2

The first answerer is correct in his meanings.

However, you used the work 'jargon' incorrectly. Those are 'cliches'. Jargon is a sub-language used by certain professions and social groups. Engineers use terms only other engineers understand, Catholics use terms only other Catholics would understand and so on.