I believe it most often refers to the fact that two people would rather be alone together than have a third person there preventing any intimacy or hindering private conversation. It's usually said by someone wanting the third person to leave the other two alone, but I don't know the historical origin. You can reference most English phrases in the Oxford History of the English Language. Many came from Shakespeare, who introduced many new words and phrases into the language, at least from the standpoint of having them written down first, but it would be hard to use very many new words in plays that the audience didn't already understand. (BTW, my favorite misunderstood one is, "cheese it, the copse", meaning 'the woods', not policemen!)
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Four and five is nine. 4 + 5 = 9 (It's a joke/riddle).
The answer to Is it a Digit? for IMP 2 math is...2 1 2 0 00 1 2 3 4This works because there are 2 zeroes, 1 one, 2 twos, and no threes or fours.
When you write two as two strikes (such as "") and then misinterpret those strikes as two identical binary strings "0011" which would be equal to two threes in decimal. Then you would have six, which is more than four.
An even number is always some quantity of 'twos' (2's), and any quantity of twos is an even number. The first even number is a quantity of twos, and the second even number is another quantity of twos. When you add the first quantity of twos to the second quantity of twos, you get a new quantity of twos. Since the new quantity of twos is a quantity of twos, it's an even number.