This foot is hardly admissible in the solemn or sublime stile. Pope has indeed admitted it into his Essay on Man:
"What can ennoble sots or slaves ŏr cōwărds,
Alas! not all the blood of all thĕ Hōwărds."
Again:
"To sigh for ribbands, if thou art sŏ sīll̆y,
Mark how they grace Lord Umbra or Sĭr Bīll̆y."
But these lines are of the high burlesque kind, and in this stile the Amphibrach closes lines with great beauty.
The Tribrach is a foot of three syllables, all short; and it may be used in the third and fourth places.
"And rolls impetŭoŭs tŏ the subject plain."
Or thus:
"And thunders down impetŭoŭs tŏ the plain."