がてら

がてら is used to express doing one action while also taking the opportunity to do another. The first action serves as the primary purpose or occasion, and the second action is done alongside it – "while doing A, I'll also do B" or "on the occasion of A, I'll do B as well." It carries the nuance that the speaker is efficiently combining two activities into one outing or occasion.

Structure

がてら attaches to:

• Verb[ます-stem]
  • がてら - Noun (of action)
    • がてら

Usage notes

• The action before がてら is typically the main or initial purpose, and the action in the second clause is something done additionally or incidentally along the way.
• がてら often implies going somewhere – it is very common when both activities involve movement or being out. It sounds most natural when the two actions can realistically be combined in one trip or outing.
• It is a relatively literary or formal expression and is characteristic of written Japanese or polished speech. In casual conversation, speakers might use ついでに instead.
• Unlike ながら, which describes two actions happening truly simultaneously (e.g., listening to music while studying), がてら implies that the two activities are done on the same occasion rather than at the exact same moment. The focus is on combining purposes rather than simultaneous performance.