I dare say

Related to I dare say: by all means, sure enough, attribute to, somehow or other

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.
See also: dare, say
Farlex Dictionary of Idioms.

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]
See also: dare, say
The American Heritage® Dictionary of Idioms by Christine Ammer.

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.
See also: dare, say
Farlex Partner Idioms Dictionary
See also:
  • (I) can't say that I do
  • can't say that I do
  • before you can say "knife"
  • before you can say knife
  • go further
  • (one's) say
  • go so far as to say
  • go so far as to say (something)
  • dare
  • do a dare