please look at this!
today I found a very interesting phrase when I reading book which was "tie the knot", I look up the dictionary then I know the meaning is getting marrage. The very interesting thing is in chinese there also is a word named 喜结连理 which means the branches of trees growing together that indicate the marriage. Very funny! My question is in your opion why the frase "tie the knot" means marrage and how to think about it, of if there is some special meaning in it?