on all fours

on all fours (on one's hands and knees) — на четвереньках

Example 1: I dropped my front wallet on the floor and spent the next ten minutes on all fours, looking for the wretched thing.

Example 2: She gets on all fours and yelps, imitating the dog. This excites the dog, who bounces around her.

...Centuries-old rock rose and fell while the beast took a calming breath. "Here is your riddle, Answerer..." It glared as if daring me to pipe up. "What creature walks on four legs in the morning, two in the afternoon, and three in the evening?" What? This wasn't the sort of riddle we used to tell back in the service tents during the Trojan War. Riddles back then were more along the lines of: "Knock knock." "Who's there?" "Euripides." "Euripides who?" "Euripides tunics and you'll have to pay for them."... You know, proper riddles, none of this bloomin' "four legs in the morning " malarkey. I frantically searched my encyclopedic brain, but the bright ideas all seemed to be hiding in the corners. "Can I consult a friend?" I asked in desperation. "I'd best get going then, 'cause my friend lives four days' march away..." "Time is up," said the Sphinx. "What is your answer?" "Just give me a sec, will you? It's... um..." "Ye-es?" "A camel? A goldfish? A parakeet? Give me a clue at least!" "Is that your final answer?" asked the Sphinx darkly. "Yes, er, no, I don't know!" I wailed. "The answer is a human," declared the Sphinx. "A baby crawls on all fours. The child and the adult walk on two legs. Then, in the twilight of life, the old must use a cane - three legs. " The Sphinx's stony lips shifted ever so slightly into what might have passed for a smile. "I can not accept your answer," said the Sphinx. "Goodbye!" (Paul Shipton, "The Pig Scrolls", 2007)