aposiopesis

aloitetun lauseen kesken jättäminen, aposiopesis puhekieltä An abrupt breaking-off in speech, often indicated in print using an ellipsis (…) or an em dash (—).
1759, (w), (w), York: Printed by Ann Ward, (w) http://www.worldcat.org/oclc/877209274 877209274; republished volume I, Basil Basel: Printed for J. L. Legrand, 1792, (w) http://www.worldcat.org/oclc/165700981 165700981, https://books.google.com/books?id=o4ATAAAAQAAJ&pg=PA123 page 123:

“My ſiſter, mayhap,” quoth my uncle Toby, “does not choose chuſe to let a man come so near her ****.” Make this daſh,—’tis an Apoſiopeſis.—Take the daſh away, and write Backſide,—’tis Bawdy.

“Have fire in this garret before night or—” / He stopped because he could not go on. It was an aposiopesis of the purest kind.