Jiʾtu ḥīnaʾidhin: the past verb has subject tāʾ; ḥīna is an accusative time adverb and mudāf; idh is its complement, and the tanwīn compensates for the omitted clause after idh.
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Full Parsing with Compensation
Tanwīn: Five Types, Their Function, and Omission
Jiʾtu ḥīnaʾidhin: the past verb has subject tāʾ; ḥīna is an accusative time adverb and mudāf; idh is its complement, and the tanwīn compensates for the omitted clause after idh.