n [U] time when darkness comes; dusk 傍晚; 黄昏
*We hope to be back by nightfall. 我们希望傍晚时能回来.
the time when it begins to get dark in the evening
= dusk Don't worry, we'll be back by nightfall.
1. The young couple are often seen walking along the beach in the nightfall. 人们常常看到那对年轻夫妇在傍晚沿着海滩散步。