My book has the following phrase:
We can argue about how well these laws are working in the US and other countries, but the general idea is a sound one
What does that mean exactly? My guess would be "as a whole" but I'm not sure
The English word sound is related to the germanic word for health (Gesundheit in modern German) and the word meant "possessing physical integrity, intact, not missing (body) parts".
Its meaning has broadened to "sturdy, not about to fall apart or collapse, not defective", and it can be applied both to things and ideas:
A chair can be sound or unsound.
A bridge can be sound or unsound.
An idea can be sound or unsound.