This
database is a comprehensive collection of all the American idioms and slang available.
American Idioms are many and varied. We hope you enjoy our collection. We are adding more all the time.
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A battle of nerves is a situation where neither side in a conflict or dispute is willing to back down and is waiting for the other side to weaken.
('A war of nerves' is an alternative form.)
The word of the law means that the law is interpreted in an absolutely literal way which goes against the ideas that the lawmakers had wished to implement.