I had also forgotten to remind my friends and teachers to bring their own knife and fork to our lunch, but fortunately one of my friends managed to get hold of some spare knives and forks.

get 在这里是动词，意思是"获得、拿到"。 hold 是动词，意思是"握住、持有"。 of 是介词，表示所属关系或来源。 get hold of 是一个固定短语，意思是"设法得到、弄到"，强调通过努力或偶然机会获得某物。