speak by the card

speak by the card

To speak with accuracy and exactness. The "card" in this now-obsolete phrase might have referred to a sea chart, which was considered very precise. I always trust a man who speaks by the card—it inspires great confidence.
See also: by, card, speak
Farlex Dictionary of Idioms.
See also:
  • pinpoint accuracy
  • autem cackler
  • turn about
  • plight
  • plight (one's) troth
  • plight troth
  • plight your troth
  • troth
  • plight troth to
  • plight (one's) troth to (someone)
References in classic literature
At any rate, it was more like a hearse than any thing else, though to speak by the card, it was a gondola.