cool as a cucumber

Before 1727

cool as a cucumber

1. (simile) Calm and composed even in difficult or frustrating situations; self-possessed.

   Even during the elections, Josh was as cool as a cucumber.

   • 1731, Jonathan Swift, Alexander Pope, Miscellanies: The Last Volume

     Pert as a Pear-Monger I'd be,

     If Molly were but kind;

     Cool as a Cucumber could see

     The rest of Womankind

   • 2011 January 8, Chris Bevan, “Arsenal 1 - 1 Leeds”, in BBC‎:

     Seconds later, Dowd was pointing to the spot again - this time without changing his mind - after Walcott was tugged back by Parker. Fabregas, cool as a cucumber, fired his penalty straight down the middle of the goal.

• calm, collected, composed, cool, in control, level-headed, rational, self-possessed

• cool, calm and collected