cling on/hang on by your fingertips

if you are clinging on by your fingertips, you are only just managing to avoid danger or failure.

We were clinging on by our fingertips, desperately trying to stop them scoring another goal. (usually in continuous tenses)

• a feeding frenzy
• a feel for
• a feel for something
• a femme fatale
• a fender bender
• a few fries short of a Happy Meal
• a fifth wheel
• a fifty-fifty chance
• a fight for life
• a fighting chance
• a fig leaf
• a figment of imagination
• a figment of your imagination
• a figure of fun
• a fine kettle of fish
• a fine line
• a finger in every pie
• a firm hand on the tiller
• a fishing expedition
• a fish out of water
• a flash in the pan
• a flight of fancy
• a flight of fantasy
• a flight of imagination
• a flip-flop