to be sure adv. phr. Without a doubt; certainly; surely.
"Didn't you say Mr. Smith would take us home?" "Oh, yes. To be sure, I did." ■ Often used before a clause beginning with "but".
He works slowly, to be sure, but he does a good job.
To be sure, Jim is a fast skater, but he is not good at doing figures. Synonym: OF COURSE.
[TahlilGaran] English Idioms Dictionary ▲