I dare say
I venture to assert or affirm, as in I dare say my point of view will be heard. [c. 1300]
Also, I daresay. I presume or assume to be likely, as in I daresay you'll be invited. This usage is more common in Britain than in America. [Mid-1700s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.