noun, masculine/ˌpet͡ʃo ˈfɾio/plural: pechos fríos
A sports player or team who does not play with passion or interest, especially one that fails at critical moments; a menace, a tilted person, a person on tilt
“Antes de ganar la Copa Mundial, lo acusaron a Lionel Messi de ser pecho frío.” — Before winning the World Cup, Lionel Messi would be accused of being "cold-chested."
Antonyms: tomar a pecho
From pecho (“chest, heart”) + frío (“cold”). Literally, “cold chest(ed)”.