a court of law which is not official and which judges someone in an unfair way.

A kangaroo court was set up by the strikers to deal with people who had refused to stop working.

• flush out
• flush out someone
• flush out something
• fly blind
• fly-by-night
• fly by the seat of pants
• fly by the seat of your pants
• flying high
• fly in the face of
• fly in the face of something
• fly in the ointment
• fly into a rage
• fly off the handle
• fly-on-the-wall
• fly on the wall
• fly the coop
• fly the flag
• fly the nest
• foam at the mouth
• foaming at the mouth
• fob off on
• fob off on someone
• fob something off on
• fob something off on someone
• foist on