"shadowing" in the noun sense
1. shadowing, tailing
the act of following someone secretly
"shadowing" in the verb sense
1. shadow
follow, usually without the person's knowledge
"The police are shadowing her"
2. shadow, shade, shade off
cast a shadow over
3. shadow, overshadow, dwarf
make appear small by comparison
"This year's debt dwarfs that of last year"
Source: WordNet® (An amazing lexical database of English)
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