Speak frankly and bluntly, be explicit, as in You can always trust Mary to call a spade a spade. This term comes from a Greek saying, call a bowl a bowl, that was mistranslated into Latin by Erasmus and came into English in the 1500s. Also see tell it like it is.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Company. All rights reserved.