straight as a die
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straight as a dieBRITISH
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.
straight as a die1 absolutely straight. 2 entirely open and honest.
1 1920 Blackwood's Magazine The…Ganges Canal…runs straight as a die between its wooded banks.
(as) straight as a ˈdie
1 in a straight line or direction: The road runs northwards, as straight as a die.
2 honest: Carol would never steal anything — she’s as straight as a die. OPPOSITE: (as) slippery as an eel