There seems to be a lack of concensus on the definition of choking. To me, if a professional bowler (or other athlete) makes a mistake (misses mark, timing is off) then he choked. I treat making a mistake and choking as the same thing. Choking probably is more applicable to a pressure situation, though. On tour and on TV certainly qualifies. Based on those definitions, we don't need to be professionals to say somebody choked, just be able to observe they made a mistake. It's as simple as pulling a shot or not getting enough fingers in the ball and it comes up light.
 Now I'm not calling anyone a "choke artist" or anything like that, but let's face it, some people handle pressure better than others. I think you can be a good bowler and a choke artist at the same time. If you consistently make the broadcast and come up short of the title, what are the reasons. If it's 'cause your opponent rolls a 289...ok. If it's because one more strike to seal the win and you pull it, bad release, timing is off, whatever, you're choking. If you bury the ball and get a 9 count, that's not choking.