Call My Bluff is a famous game show on British TV where two teams of celebrities take it in turn to provide three definitions of an obscure word, only one of which is correct. The other team then has to guess which is the correct definition, the other two being bluffs.
Watch this video and see if you can guess the meaning of the word.
If you want to have a go at playing the game click here.
Here is a link with an extensive list of explaining and clarifying expressions to use.