'Designs' in the Bible

So Jehu, the son of Jehoshaphat, the son of Nimshi, made designs against Joram. (Now Joram and all the army of Israel were keeping watch on Ramoth-gilead because of Hazael, king of Aram:

And in the morning he went out and, stopping, said to all the people there, You are upright men: it is true that I made designs against my master, and put him to death; but who is responsible for the death of all these?