Optional omission: recoverable from context, as in «خَيْرَ مَقْدَمٍ».
Attested obligatory omission: fixed idiomatic expressions such as «سُقْيًا» and «شُكْرًا».
Both involve implicit verbal meaning, but the conditions for omitting the verb differ.
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Optional vs. Conventional Obligatory Ellipsis
The Accusatives: Al-Mafʿūl al-Muṭlaq
Optional omission: recoverable from context, as in «خَيْرَ مَقْدَمٍ».
Attested obligatory omission: fixed idiomatic expressions such as «سُقْيًا» and «شُكْرًا».
Both involve implicit verbal meaning, but the conditions for omitting the verb differ.