something God finds utterly loathsome and will not have near him: above all an idol, or the filth that idol worship drags in
The word begins in the body, not the courtroom. It belongs to a family of Greek words for turning away from something because of its smell, and the verb behind it, βδελύσσομαι, meant to recoil from a stench. So this is not a formal label for "a very wicked act". It names a reaction: a shudder of disgust. What makes the word so heavy in the Bible is whose disgust it is. God is the one turning away.
It is essentially a Bible word. The verb and its adjective were ordinary Greek, but this noun barely appears outside Jewish and Christian writing. The translators who put the Hebrew scriptures into Greek reached for it to carry two Hebrew words for what God detests, תּוֹעֵבָה and שִׁקּוּץ. Those words covered a wide field: idol worship, unclean food, forbidden sexual practice, crooked scales. But because so much of that field was funneled into this one Greek word, and because idol worship dominated it, the word came into the New Testament already smelling of idols.
That is what holds its range together. Idol worship is the pattern case, and the other uses radiate out from it. The defiling thing set up in the temple is idolatry planted in the one place it must never stand. The cup in the hand of Babylon in Revelation is idolatry served as a drink, which is why the word sits beside sexual betrayal there: worshipping an idol (εἴδωλον) was long pictured as adultery against God. And when Jesus tells the money-loving religious leaders that what people hold in high esteem is loathsome in God's sight, he takes the horror reserved for a desecrated sanctuary and turns it on respectable human pride.
The famous phrase in Matthew and Mark, usually given as "the abomination of desolation", is a description rather than a title. It means the disgusting thing that leaves the place empty and ruined: bring that in, and God's house is a wasteland. Jesus' hearers knew the phrase from Daniel and from the memory of a Greek king who had done exactly that to the temple two centuries earlier. What event Jesus was pointing at in his own century is one of the most argued questions in the Gospels.
Nuances
What historical event or figure the desolating abomination of Mark 13:14 and Matthew 24:15 refers to.
- contestedThe seizure of the temple by Jewish revolutionaries in the winter of 67 to 68 CE, including their installation by lot of a man of no priestly descent as high priest. It fits Mark's picture of a person, still leaves time for the flight Jesus urges, and Josephus himself calls the resulting defilement an abomination.; Joel Marcus, Mark 8-16 (Anchor Yale Bible, 2009), 890-891; Robert H. Stein, Jesus, the Temple and the Coming Son of Man (2014), 85-93
- contestedThe crisis of 40 to 41 CE, when the emperor Gaius ordered his statue set up in the temple. Since the plan collapsed at his assassination, this is best taken as the background out of which the warning grew rather than its fulfillment.; Adela Yarbro Collins, Mark (Hermeneia, 2007), on 13:14
- minorityThe Roman standards brought into the temple precincts in 70 CE, which bore imperial images and were offered sacrifice. Critics answer that by then flight was impossible, so the warning would come too late to obey.; H. A. W. Meyer, Critical and Exegetical Handbook to the Gospels of Mark and Luke, on Mark 13:14
- contestedThe language is prophetic imagery about the fate of Jerusalem within history rather than a pointer to one identifiable object, so pressing for a single literal referent misreads the discourse.; R. T. France, The Gospel of Mark (NIGTC, 2002), on 13:14; N. T. Wright, Jesus and the Victory of God (1996), 339-368
- minorityA double reference: a first-century desecration of the temple together with a still future figure of lawlessness who takes his seat in God's sanctuary, on the pattern of 2 Thessalonians 2:3-4.; Desmond Ford, The Abomination of Desolation in Biblical Eschatology (1979)