{v. phr.}, {informal} To let a smile show on one's face; permit a smile to appear. * /Bob told the whole silly story without even cracking a smile./ * /Scrooge was a gloomy man, who never cracked a smile./ * /When we gave the shy little boy an ice cream cone, he finally cracked a smile./
CRACK A SMILE
Meaning of CRACK A SMILE in English
Dictionary of English idioms . Словарь английских идиом. 2012