From The Collaborative International Dictionary of English v.0.44 [gcide]:
From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
66 Moby Thesaurus words for "gumshoe": Dogberry, John Law, Sherlock, Sherlock Holmes, beagle, bluecoat, bobby, bull, cop, copper, couch, crawl, creep, dick, eye, flatfoot, flattie, fuzz, gendarme, go on tiptoe, grovel, gumshoe man, hawkshaw, heat, inch, inch along, investigator, lay wait, lie in wait, lurk, nightwalk, officer, pad, peeler, pig, plainclothesman, police officer, private eye, prowl, pussyfoot, scrabble, scramble, shadow, shamus, shirk, sidle, skip tracer, skulk, sleuth, sleuthhound, slink, slip, snake, sneak, spotter, stalk, steal, steal along, tec, the cops, the fuzz, the law, tippytoe, tiptoe, worm, worm along
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