'Act' in the Bible

Be strong and act like men, you Philistines, or else you will wind up serving the Hebrews the way they have served you! Act like men and fight!"

So Jonathan said to {his armor bearer}, "Come, let us go over to the garrisons of these uncircumcised; perhaps Yahweh will act for us, for there is no hindrance for Yahweh to save by many or by few."

Do I have such a shortage of crazy people that you brought this one to act crazy around me? Is this one going to come into my house?”

May the LORD act as judge, and may he decide between me and you. May he see, may he plead my case, and may he vindicate me in this dispute against you."