People often say "The word rapture does not appear in the Bible", and they are correct in our english translations. We cannot be students of the Word using that thinking. We have to dig deeper and study words, cultures, history and compare across the entire span (story) of the Bible. This is what Paul meant when he told Timothy to "rightly divide (dissect) the Word of Truth."
It was customary in the ancient Jewish wedding proceedings for the groom to go away and build a house for he and his bride - often on his fathers property or a nook in his house. Then at the fathers determination, he would tell his son to go and get his bride. The procession of getting the bride had her lifted up off the earth and carried away to the father's house. The bride and groom would seclude to the bridal chamber for a period of seven (a week) and the marriage would be consummated. Literally the father would tell the son to go catch away his bride.
Now, let us properly dissect 2 Thessalonians 2:3 "Let no one deceive you by any means; for that Day will not come unless the falling away comes first, and the man of sin is revealed, the son of perdition." We have all been taught that there will be a great departure from the faith - some versions say "apostasy". Taking the phrase "falling away" to its root expresses the idea of "departure, up / out of" (Strongs Greek: G575). Wow, that puts a whole new twist on the phrase. It is worthy of our consideration and our study.