You keep a civil tongue in your unprepossessing face.
5 seconds sound clip from the McLintock! (1963) movie soundboard.
You can hear this line at 00:29:20 in the Blu-ray version of the movie.
Quote context
[...]
- Alice, you want to help, too?
- I'll wash, and you kids can dry. Is that good?
- Don't seem possible one woman could use all them clothes.
- You keep a civil tongue in your unprepossessing face.
- And unload my baggage, please.
- By the way, what does that word, unprepossessing, mean?
[...]