فإن قوله: «اضرب» مختصر من قوله: «افعل فعل الضرب».
“Strike” is linguistically an instruction to perform an act belonging to the category of striking.
The verb names the kind of act, not the full number of its possible instances. A single instance belongs to that kind; repeated instances are further occurrences of the same kind.
Genus of the act refers to the type of action under which instances fall. The command “strike” does not, merely by using a verb in the imperative, quantify every possible occurrence or demand indefinite repetition.
This is a technical illustration about the meaning and number of commanded acts. It does not establish permission to inflict actual physical harm; the legality of an action is a separate question.