I dare say
I assume, assert, or am quite certain. (Somewhat formal or old fashioned.) I dare say we'll hear from him again before the year is done. These trips are always rather tedious, but I dare say we'll be able to find something to divert our attention.
I dare say
1. I venture to assert or affirm, as in I dare say my point of view will be heard. [c. 1300]
2. 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]
I dare ˈsay
(spoken) I suppose; it seems probable: I dare say what you say is true, but it’s too late to change our plans now.