The origin of the idiom "on all fours" can be traced back to the literal posture of animals, particularly quadrupeds, who move or stand by supporting their body weight on all four limbs. The phrase is now used metaphorically to refer to a human imitating this posture, either by crawling or bending down on hands and knees.

Визначення та значення слова «on all fours» англійською мовою

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