If we try a guess: “thmyl” = “they’ll” (common contraction). Check mapping: t→t, h→h, m→e, y→y, l→l – doesn’t match.
“bdwn” – 5 letters, maybe “below” or “brown” or “be down” without space. thmyl jmy hlqat wn bys bdwn nt
Given the phrase “bdwn” strongly suggests original Arabic “بدون” = “without”. That means the plaintext is Arabic transcribed, but each letter shifted in Latin alphabet. If we try a guess: “thmyl” = “they’ll”