something that you buy or accept without first seeing it or knowing what it is like, with the result that it might not be what you want.

Clothes from a catalogue are a pig in a poke. You can't feel the quality of the fabric or know if the clothes will fit.

• a family man
• a far cry from
• a far cry from something
• a fashion victim
• a fast talker
• a fast track
• a fat cat
• a fate worse than death
• a fat lot of good
• a fat lot of use
• a faux pas
• a favourite son
• a feather in cap
• a feather in someone's cap
• a feather in your cap
• 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