Correct

搭便

/ dā biàn / 
Strokes

Definition

at one's convenience/in passing

Example

As an Adverb

incidentally

1
Wǒ
我
shì
是
chūchāi
出差
dā
搭
biàn
便
lái
来
kànkan
看看
dàjiā
大家
  
。

I am just dropping in on you from a business trip. / I have come to see you while I am on a business trip.