cliché: as plain as the nose on your face

Meaning: Very obvious (definition).

Example: The sore on his lip was as plain as the nose on your face. (Source.)

Origins: Shakespeare’s The Two Gentlemen of Verona, Thomas Hardy’s Pair Blue Eyes, 1873. (Origins.)

Rewrites:

• as plain as the snout on a sow
• as obvious as the horn on a rhino
• as evident as a turret on a tank
• as patent as whiskers on a chin
• as sure as cute on a kitten

Discussion: Although the idiom is mostly about everyday obviousness, you might also read it to be about plainness and certainty.