This is the 15160th most frequent German word.
säumten
"Säumten" is the past tense of "säumen," meaning "lined" or "bordered."
In this sentence, 'säumten' is used to describe how the spectators formed a line or 'rimmed' along the streets, implying their arrangement around the space.
Die Zuschauer säumten die Straßen während des Umzugs.
The spectators lined the streets during the parade.
Here, 'säumten' communicates that the trees were positioned alongside the driveway in an orderly fashion, lining it.
Die Bäume säumten die Auffahrt, was ihr einen beeindruckenden ersten Eindruck verlieh.
The trees lined the driveway, giving it an impressive first impression.
In this case, 'säumten' is used metaphorically, where the drawings are described as forming a 'line' alongside the path.