がてら
(Ga tera)
while (also) / taking the opportunity to.
Connection rules
- +V ます-stem + がてら; noun + がてら.
- +Convenient addition — Y is done taking advantage of X.
- +Similar to 〜ついでに (more common in speech).
Examples
1.
散歩がてら、買い物に行った。

Sanpo ga tera, kaimono ni i ta.
While on a walk, I also went shopping.
「while (also) / taking the opportunity to」
2.
仕事がてら、観光を楽しんだ。

Shigoto ga tera, kankou o tanoshin da.
On a work trip, I enjoyed some sightseeing.
「while (also) / taking the opportunity to」
Practice
While taking a walk, I think I'll drop by the bookstore.
___、本屋に寄ってみようと思う。
Romaji also accepted