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tail2 [transitive]
informal to follow someone and watch what they do, where they go etc :
The police have been tailing him for several months.
The police have been tailing him for several months.tail away
phrasal verbtail back
phrasal verb British EnglishTTC if traffic tails back, a long line of cars forms, for example because the road is blocked
tail off
phrasal verb1 to become gradually less, smaller etc, and often stop or disappear completely :
Profits tailed off towards the end of the year.
Profits tailed off towards the end of the year.2 written if someone's voice tails off, it becomes quieter and then stops :
'I didn't mean ...' Her voice tailed off in embarrassment.
'I didn't mean ...' Her voice tailed off in embarrassment.