قَعَدْتُ جُلُوسًا
Translation: I sat—an act of sitting.
قَعَدْتُ: past verb and subject pronoun; its customary maṣdar is also “quʿūd”.
جُلُوسًا: accusative maṣdar of “jalasa”, functioning here as an absolute object through semantic correspondence.
Source example: the lexical roots q-ʿ-d and j-l-s differ, but both convey sitting.