duì​le

by the way

对了 (對了) duì​le
by the way adjective
used as an interjection when one suddenly remembers something or wants to change the topic

By the way, are you free to go to the bookstore with me tomorrow?

correct adjective
used to indicate that something is accurate or right

As long as you are willing to work hard, you are on the right track.

Frequency

Movie subtitles
12.6 per million appears in 6% of films

Sources

Definitions
CC-CEDICT
Frequency data
SUBTLEX-CH