The girl obeyed. She arranged the cello on the back seat and leaned forward to the dashboard so she could watch the two women approach the wire and unpeg the sheets. They faced each other, joined by the cloth, and raised their arms in unison, they shook the cloth and snapped it tight, they advanced and retreated until each sheet was a flat bundle in Athena’s arms. Poppy saw that they were speaking, with pauses, but she could not hear what they were saying.
in the phrase "they shook the cloth and snapped it tight", does "snap it tight" mean: They seized the cloth and pulled it firmly?
Here "snap" is a transitive verb and I searched its meaning in the dictionary but again the meaning of this phrase was unclear to me.