Definition of "in twos" [in twos]

• Grouped by pairs; arranged in groups of two. (adverb)

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• "You must, of course, go on bearing children, but, so they say, in twos and threes, not in tens and twelves."
• "But Dublin, no matter what remained, was new with gay men in twos or threes or hungry ones alone on their way to the Front Lounge or GUBU or some new joint that I have yet to hear about."
• "Ranji's group threw back one counterattack after another as they continued to move upslope, traveling in twos and threes to further confuse an already badly rattled enemy."