/ˈʃædəʊ ||; ˈʃædo/noun1 [C] a dark shape on a surface that is caused by sth being between the light and that surface 影子；阴影: The dog was chasing its own shadow. 那只狗在追逐自己的影子。The shadows lengthened as the sun went down. 太阳下山的时候，影子越拉越长。 ☞Look at penumbra and umbra. 参看penumbra及umbra。 ☞picture at shade 见shade插图
2 [U] an area that is dark because sth prevents direct light from reaching it 阴暗的地方: His face was in shadow. 他的脸落在阴影里。
3 [sing] a very small amount of sth 微量；少许: I know without a shadow of doubt that he's lying. 毫无疑问，我知道他在说谎。
cast a shadow (across/over sth)→
CAST¹