I believe it means to break Christ laws...he is antichrist...against Christ sayings and teachings....against his laws..
How will you keep from breaking Christ's laws if you don't know them?
If you stand against all that is called of God or that is worshipped, you are standing against God's worship system and his commandments.
If you are lawless, then you are lawless.
We do not have to wonder about what Jesus says on the matter, he doesn't leave any room for opinion.
You have an opinion because you don't believe Christ words, and if you don't believe Christ himself, then how can you follow his laws, or even know his laws?
Jesus came showing the great secrets of Torah, but if you despise and disrespect the Torah, how will you ever know what the secrets of Torah are, and it is not two Torahs, it is one, and neither are against the other.
But unless somebody tells you what the law of Jesus is, why do you speak of it?
Here is a secret of the law Jesus came showing, but it does not cancel out the physical law.
The Rights of the Apostles
8I am not speaking these things according to human judgment, am I? Or does not the Law also say these things? 9For it is written in the Law of Moses, "YOU SHALL NOT MUZZLE THE OX WHILE HE IS THRESHING." God is not concerned about oxen, is He? 10Or is He speaking altogether for our sake? Yes, for our sake it was written, because the plowman ought to plow in hope, and the thresher to thresh in hope of sharing the crops.
Jesus came saying that if you hate your brother, you are a murderer, but why do you suppose that murder is not longer sin?