Any of several card games resembling whist and in which points are scored in four ways: for the high trump, the low trump, the jack of trumps, and the game.(noun-plural)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "all fours" in a sentence
"That was my first shot—as well as my last—for the headless thing abandoned Malachi and turned the full force of its wrath upon me, scrambling in the wet leaves and mud on all fours as it came, like some ghastly man-size spider."
"A very large black-and-white Skoggi in a matching dark green CI—command-interface—vest bounded on all fours by her side."
"Kneel on all fours with the walldirectly behind you."