暇潰し

1. Origins, structure, and basic meaning

• Structure: 暇潰し is read as ひまつぶし and is a noun combining 暇, spare time, with the nominal element 潰し from 潰す.
• Basic usage: It describes filling otherwise idle time, such as by reading while waiting or starting a casual activity.

2. Common pitfalls and similar expressions

• に and で
  • 暇潰しに本を読む marks purpose with に, while 暇潰しで始める uses で for the original motive.
• Not necessarily a hobby
  • An activity begun to pass time may later become an important hobby, but 暇潰し itself names the initial time-filling purpose.