I can say now (what I couldn't before); now (that things have changed) I don't mind telling you; I couldn't tell you until now; I couldn't have told you this back then
Examples (2 in total)
突っ立ってないで何か言えよ。
Don't just stand there, say something.
ムスッとして座ってないで、何がいけないのか言えよ。
Don't just sit there and fume. Tell me what's wrong.