#1 shadow n. shade within clear boundaries. wn
#2 shadow n. [darkness, dark] an unilluminated area; "he moved off into the darkness". wn
#3 shadow v. follow, usually without the person's knowledge; "The police are shadowing her". wn
#4 shadow n. [apparition, phantom, phantasm, phantasma, fantasm] something existing in perception only; "a ghostly apparition at midnight". wn
#5 shadow n. a premonition of something adverse; "a shadow over his happiness". wn
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