«وَتَنَاسَيْنَا الْأَقْتَادَ»
We all but forgot the gear used for riding.
Aqtād, plural of qatad, is associated with wooden saddle frames or riding equipment. Tanāsaynā expresses forgetting—or behaving as though something has been forgotten—because the ordinary means of travel are now beyond reach.
A vocabulary distinction matters here: qatād is thorny vegetation, but aqtād is riding gear. Their similar appearance does not make them synonyms.