Tailing

Verb
tailing



Noun

 * 1) the act of following someone

Thesaurus
bugging, chasing, cloak-and-dagger work, counterespionage, counterintelligence, dogging, electronic surveillance, espial, espionage, following, heeling, hounding, intelligence, intelligence work, military intelligence, observation, pursual, pursuance, pursuit, secret police, secret service, sequel, sequence, series, shadowing, spying, stakeout, surveillance, trailing, wiretap, wiretapping