I'll say|I tell you|say|tell 成语
I'll say|I tell you|say|tell
interj.,
informal I agree with this completely.

Used for emphasis.
Did the children all enjoy Aunt Sally's pecan pie? I'll say! I'll say this is a good movie!I'll say|I acquaint you|say|tell
interj.,
informal I accede with this completely.

Used for emphasis.
Did the accouchement all adore Aunt Sally's pecan pie? I'll say! I'll say this is a acceptable movie! Dictionary