序でに
1
(hacer algo) de paso
1
while (one is at it);when;on the occasion of;at the same time (as);on one's way (to);by the way;incidentally;in passing
ついでに私のも買ってきてくれますか。
Can you buy one for me as well?
Other forms
序に 【ついでに】 (rarely used kanji form)