The term 'hanging by a thread' is an idiom that means to be in a precarious or uncertain situation. The two crossword solutions for this term are 'sewn' and 'TENUOUS'. 'Sewn' is a four letter word meaning to fasten or attach with stitches. 'TENUOUS' is a seven letter word meaning having little substance or strength. Therefore, the two crossword solutions for the term 'hanging by a thread' can be interpreted as being in a situation that is weakly attached or held together with little strength.