Shakespeare is often said to have coined numerous words that are now common in English.

coined 是动词 coin 的过去分词形式。coin 本义是"铸造硬币"，引申为"创造（新词或短语）"，因为就像铸造新硬币一样创造新词。在这里指莎士比亚创造了许多英语新词汇。