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                           general:: 
                            Phrase(s): hang by something 
1. to be suspended at the end of something, such as a rope, chain, string, etc.  •  The bag is only hanging by a string.  •  The food hung by a rope from a tree to protect it from the bears that wandered into camp now and then. 2. to dangle, suspended by some body part, such as thumbs, legs, etc.  •  I was hanging by my legs on the exercise bar when the rain started.  •  I can hang by just my middle fingers!
                        
                        
 
                        
                            McGrawhill's American Idioms And Phrasal Verbs