As with many verbs, the meaning of "remove" in the Bible varies a good bit depending on context. It generally involves a separation of spiritual states, and in most cases specifically refers to a kind of sorting-out process to separate true ideas from false ones.

(Odkazy: Arcana Coelestia 932, 3993, 4544, 6371, 7392, 9258; The Apocalypse Explained 811 [6])

In Ezekiel 26:11, this signifies the love of learning or intellectual things. (Arcana Coelestia 3727)

In Revelation 6:2, this signifies the love of understanding the Word. (Apocalypse Revealed 298)

In Zechariah 12:4, this signifies that the intellectual should be filled with falsities. (Arcana Coelestia 2383[2])

In general, 'a horse' signifies knowledge or understanding of the Word. In an opposite sense it signifies the understanding of the Word falsified by reasonings, and likewise destroyed from self-derived intelligence. 'A dead horse' signifies no understanding of truth from the Word.