* to fit like a letter in the letterbox
Expression used here and there by Some
Used to describe a situation where everything goes smoothly or as planned. To go off without a hitch.
"J'ai été obligé d'expliquer pourquoi je n'étais pas en classe hier." "Et ?" "Mon histoire est passée comme une lettre à la poste"
"I had to explain why I did not attend class yesterday" "And?" "My story fit like a letter in the letterbox"