'Dagger' in the Bible

But Ehud made him a dagger which had two edges, of a cubit length; and he did gird it under his raiment upon his right thigh.

And Ehud put forth his left hand, and took the dagger from his right thigh, and thrust it into his belly:

And the haft also went in after the blade; and the fat closed upon the blade, so that he could not draw the dagger out of his belly; and the dirt came out.

David said to the Philistine: “You come against me with a dagger, spear, and sword, but I come against you in the name of Yahweh of Hosts, the God of Israel’s armies—you have defied Him.

When they were near the big rock that is in Gibeon, Amasa came to them. Now Joab was dressed in military attire and had a dagger in its sheath belted to his waist. When he advanced, it fell out.

Aren’t you the Egyptian who raised a rebellion some time ago and led 4,000 Assassins into the wilderness?”