Describes a situation where a person or group unreasonably or in bad faith prevents another person or group from obtaining something that they want, more out of spite than anything else. Because the rationale of the blocking party is often petty or personal the term 'crock' is used.
A variation on 'cock-block', although it can be used in more situations and being PG-13 in nature as well as humorous is also suitable for work or most social situations.
'Boston College cannot crock-block UConn out of the ACC forever. UConn has too much to offer.'
'Peter Marshall was ambivalent about taking the hosting gig for Hollywood Squares in 1966 but he did it as much to crock-block Dan Rowan (whom he loathed) as anything else.'
'Pierce Brosnan was offered the role of James Bond in the 80s but the producers of Remington Steele crock-blocked him.'
The "crock-block" or "Crocket Curse" is a term used to describe horrific travel issues that fencing referees endure such as hours-long flight delays, flight cancellations, missed connections, or lost luggage.
It was lovingly named after referee Daniel Crocket who experiences more horrific travel issues than any other referee. Referees sharing flights with Crockett are often terrified that they will not make it to the tournament.