This is the 17257th most frequent Russian word.
суду
"Суду" is the dative case form of "суд," meaning "to the court" or "to the vessel/ship," depending on context.
Here, "суду" is in the dative case, denoting the entity (court) receiving the assistance.
Я вызвал экспертов для оказания помощи суду.
I summoned experts to assist the court.
In this case, "суду" signifies the object (boat) in the dative case, indicating the direction of the approach.
Катя подошла к суду на набережной.
Katya approached the boat on the riverbank.
Here, "суду" is used in the instrumental case form derived to denote 'following a judgement'. This usage is less common.