WordReference Random House Learner's Dictionary of American English © 2019
dog /dɔg, dɑg/USA pronunciation   n., v.,  dogged, dog•ging. 
n. [countable]
  1. Dog and Cat Breedsa common four-legged animal kept as a pet and bred in many varieties.
  2. Mammalsa wild four-legged animal related to this, such as the wolf.
  3. a despicable man or youth:What a dirty dog he is, leaving you like that!
  4. Informal Termsa fellow:He's a lucky dog.
  5. Slang Termsdogs, [plural] feet:My dogs are killing me.
  6. Slang Termssomething worthless or of extremely poor quality:That movie was a dog.
  7. [Slang.]a very unattractive person.

v. [+ object]
  1. to follow closely like a dog;
    pursue:The agency was dogged by complaints.
Idioms
  1. Idiomsgo to the dogs, to go to a worse state or condition;
    deteriorate;
    degenerate.
  2. Idiomslet sleeping dogs lie, to leave an existing situation alone rather than risk doing something to make it worse.


WordReference Random House Unabridged Dictionary of American English © 2019
dog  (dôg, dog),USA pronunciation n., v.,  dogged, dog•ging. 
n. 
  1. a domesticated canid, Canis familiaris, bred in many varieties.
  2. Mammalsany carnivore of the dogfamily Canidae, having prominent canine teeth and, in the wild state, a long and slender muzzle, a deep-chested muscular body, a bushy tail, and large, erect ears. Cf. canid.
  3. the male of such an animal.
  4. any of various animals resembling a dog.
  5. a despicable man or youth.
  6. Informal Termsa fellow in general:a lucky dog.
  7. Slang Termsdogs, feet.
  8. Slang Terms
    • something worthless or of extremely poor quality:That used car you bought is a dog.
    • an utter failure;
      flop:Critics say his new play is a dog.
  9. [Slang.]an ugly, boring, or crude person.
  10. [Slang.]See  hot dog. 
  11. Slang Terms(cap.) [Astron.]either of two constellations, Canis Major or Canis Minor.
  12. [Mach.]
    • Mechanical Engineeringany of various mechanical devices, as for gripping or holding something.
    • Mechanical Engineeringa projection on a moving part for moving steadily or for tripping another part with which it engages.
  13. MetallurgyAlso called  gripper, nipper. a device on a drawbench for drawing the work through the die.
  14. a cramp binding together two timbers.
  15. Mechanical Engineeringan iron bar driven into a stone or timber to provide a means of lifting it.
  16. an andiron;
    firedog.
  17. Meteorologya sundog or fogdog.
  18. Telecommunicationsa word formerly used in communications to represent the letter D.
  19. Idiomsgo to the dogs, [Informal.]to deteriorate;
    degenerate morally or physically:This neighborhood is going to the dogs.
  20. Idiomslead a dog's life, to have an unhappy or harassed existence:He maintained that he led a dog's life in the army.
  21. Idiomslet sleeping dogs lie, to refrain from action that would alter an existing situation for fear of causing greater problems or complexities.
  22. Idiomsput on the dog, [Informal.]to assume an attitude of wealth or importance;
    put on airs.

v.t. 
  1. to follow or track like a dog, esp. with hostile intent;
    hound.
  2. to drive or chase with a dog or dogs.
  3. [Mach.]to fasten with dogs.
  4. dog it, [Informal.]
    • to shirk one's responsibility;
      loaf on the job.
    • to retreat, flee, renege, etc.:a sponsor who dogged it when needed most.
dogless, adj. 
doglike′, adj. 
  • Middle English dogge, Old English docga bef. 1050

Collins Concise English Dictionary © HarperCollins Publishers::
dog /dɒɡ/ n
  1. a domesticated canine mammal, Canis familiaris, occurring in many breeds that show a great variety in size and form
  2. any other carnivore of the family Canidae, such as the dingo and coyote
  3. the male of animals of the dog family
  4. (modifier) spurious, inferior, or useless
  5. a mechanical device for gripping or holding, esp one of the axial slots by which gear wheels or shafts are engaged to transmit torque
  6. informal a fellow; chap
  7. informal a man or boy regarded as unpleasant, contemptible, or wretched
  8. slang an unattractive or boring girl or woman
  9. US Canadian informal something unsatisfactory or inferior
  10. short for firedog
  11. a dog's chanceno chance at all
  12. a dog's dinner, a dog's breakfastinformal something that is messy or bungled
  13. a dog's lifea wretched existence
  14. dog eat dogruthless competition or self-interest
  15. like a dog's dinnerinformal dressed smartly or ostentatiously
  16. put on the dogUS Canadian informal to behave or dress in an ostentatious or showy manner
vb (dogs, dogging, dogged)(transitive)
  1. to pursue or follow after like a dog
  2. to trouble; plague
  3. to chase with a dog or dogs
  4. to grip, hold, or secure by a mechanical device
adv
  1. (usually in combination) thoroughly; utterly: dog-tired

See also dogsEtymology: Old English docga, of obscure origin
'a dog's life' also found in these entries:
dog - lead
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