to worry beforehand
Promerimnao describes being told not to prepare anxious concern in advance about what to say when brought for delivery.
The attested use is a prohibition of advance concern over what to say when people are brought to be delivered, as the clause in Mark 13:11 shows.
Senses in use
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Avoiding advance concern about what to say · dominant
In Mark 13:11, the present active plural form addresses those who are brought to be delivered and forbids concern beforehand about what they will say. The APB renders the clause, “do not worry beforehand what you will say,” before directing them to say what is given in that hour.
In the Anselm Project Bible: In Mark 13:11 the APB presents the clause as “do not worry beforehand what you will say.” This wording confirms the clause's overall setting rather than isolating each element of the Greek form.