"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

3. tail

remove the stalk of fruits or berries

Source: WordNet® (An amazing lexical database of English)

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