tse.diy.yah denotes an ambush or concealed hostile action, contrasted with acting without one.

The term denotes an ambush in a legal contrast between a hostile act done from concealment and an act done without such concealment.

1. Concealed hostile action · dominant

   In Numbers 35:20, the feminine singular absolute noun occurs in the clause about throwing something upon a person in a hostile setting; the APB renders the clause "from ambush." In Numbers 35:22, the same form is negated in the contrasting case of throwing an implement "without ambush."

   Numbers 35:20Numbers 35:22

In the Anselm Project Bible: The APB presents the contrast explicitly as "from ambush" in Numbers 35:20 and "without ambush" in Numbers 35:22. These phrases confirm the clauses' contrast rather than establish a finer distinction.