Ṣahin is an indeclinable ism fiʿl amr meaning “be silent.” Its tanwīn denotes unspecified meaning, not a new case ending.
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Parsing an Indeclinable Expression
Tanwīn: Five Types, Their Function, and Omission
Ṣahin is an indeclinable ism fiʿl amr meaning “be silent.” Its tanwīn denotes unspecified meaning, not a new case ending.