wear a long face

When you are labeled 'serious' in the U.S., you are expected to wear a long face all the time.

"Amid the general dance and minstrelsy" who would wear a long face, unless it were in sympathy with his length of ears?

I'll take care not to marry a glum man, anyhow; not that I want my future lord and master to be a teller of stories, a wit, or a particularly funny man—but he shan't wear a long face and make me wear a long one, though he may be as pious as the day is long and must be, what's more.

You will not do your business better because you wear a long face all the time; you will do it worse.

I've had to wear a long face years enough—seven hard years, seven fearful years, when I might be murdered by a slave, and I and my slaves might be murdered by some stray brigade, under some general of Ismail's, working without orders, without orders, of course—oh, very much of course!