straight as a die

Meanings

1. Completely or totally straight.

Etymology

* Used in the sense of ‘correct,’ attested since April, 1871, originally American English, from the 18th-century expression as true as a die, from the 16th-century expression as smooth as a die, referring to the osseous substance that dice were formerly created with. * Possibly connected with, or confused with, the metal-cutting tool called a die.