'Re-double' as in 're-doubling our efforts'. Almost meaningless in that it's impossible to quantify. Popular with certain politicians who want to appear to be on the case. Trust no-one who uses this term. (Unless they are playing contract bridge, where the term has a precise meaning.)
'Unchartered' when they mean 'uncharted'.
'That's what _____is all about.' Often used in a sporting context by pundits. Typically the FA Cup when small club plays big club. You might have 5 pundits with each of them saying that 'something' is what the FA Cup is all about. The something could...
In the specific context of radio phone-ins and interviews, the use of 'how are you?' as the reflexive introduction by the host. This often prompts the response of 'how are you?'. So we now have 2 meaningless questions. It's meaningless because it's a redundant question: NOBODY WANTS A GENUINE...