Between the Lines is an idiom that refers to understanding something without it being explicitly stated. The term can be broken down into three crossword solutions: TACIT (5 letters), READ (4 letters), and SUBTLE (6 letters). TACIT means understood or implied without being stated directly, READ means to interpret or understand something, and SUBTLE means delicate or hard to detect. Together, these words describe the concept of understanding something without it being explicitly stated.