The grapes shriveled after being left in the sun for several days.

shriveled 是动词 shrivel 的过去分词形式。shrivel 的意思是"枯萎、皱缩"，通常指植物或水果因失去水分而变得干瘪、皱缩。这里描述葡萄在阳光下暴晒后失去水分变得干瘪的状态。