"tailing" in the noun sense
1. shadowing, tailing
the act of following someone secretly
"tailing" in the verb sense
1. chase, chase after, trail, tail, tag, give chase, dog, go after, track
go after with the intent to catch
"The policeman chased the mugger down the alley"
"the dog chased the rabbit"
2. dock, tail, bob
remove or shorten the tail of an animal
remove the stalk of fruits or berries
Source: WordNet® (An amazing lexical database of English)
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