straight as a die


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straight as a die

BRITISH
1. If someone is straight as a die, they are completely honest. There was no doubting his honesty — he was as straight as a die.
2. If something is straight as a die, it is very straight. The track runs straight as a die for several kilometres. Note: A die is a specially shaped block of metal which is used to cut or form other metal into a particular shape. This expression may refer to dies which were used to produce designs on coins. The metalworkers needed to strike the die with a hard straight blow from a hammer, in order to leave a clear impression on the coin.
See also: die, straight