Learn a Phrase: Without a Hitch

Well, I thought I knew the word "hitch" already. However, when I saw the following title, I realized that I still did not know the phrase "without a hitch" yet. Can you figure it out?

Beijing iPhone Launch Goes Off Without a Hitch
http://blogs.wsj.com/digits/2013/09/20/beijing-iphone-launch-goes-off-without-a-hitch/#!

Surfer_Diver
2013.9.20