hitch

hitch: an unexpected difficulty, obstacle, delay, etc.

A slight hitch can lead to a deadly disaster. 差之毫厘，谬以千里

without a hitch 非常顺利

a technical hitch（技术故障）

a legal hitch（法律问题）

a slight/minor/major hitch周杰伦在北京顺利举办了一场演唱会。

Jay Chou's concert was held in Peking without a hitch.

（参考翻译：Jay Chou’s concert in Beijing went off without a hitch. 或者 Jay Chou’s concert was held in Beijing without a hitch.）