by your fingertips

by (one's) fingertips

Narrowly avoiding problems or failure. They're clinging on by their fingertips out there—the other team's offensive is totally overwhelming them. Now that I have three small children to care for, I feel as if I'm hanging on by my fingertips every day.
See also: by, fingertip

by your fingertips

only with difficulty; barely.
1990 Current History In early 1988 , United States Assistant Secretary of State Elliott Abrams said that General Noriega was clinging to power ‘by his fingertips’.
See also: by, fingertip