UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈbʌm/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/bʌm/ ,USA pronunciation: respelling(bum)

Inflections of 'bum' (adjadjective: Describes a noun or pronoun--for example, "a tall girl," "an interesting book," "a big house."):
adj comparative
adj superlative
Inflections of 'bum' (v): (⇒ conjugate)
v 3rd person singular
v pres pverb, present participle: -ing verb used descriptively or to form progressive verb--for example, "a singing bird," "It is singing."
v pastverb, past simple: Past tense--for example, "He saw the man." "She laughed."
v past pverb, past participle: Verb form used descriptively or to form verbs--for example, "the locked door," "The door has been locked."

WordReference Random House Learner's Dictionary of American English © 2020
bum1 /bʌm/USA pronunciation   n., v.,  bummed, bum•ming, adj.,  bum•mer, bum•mest. 
n. [countable]
  1. a person who avoids work and lives off others.
  2. Informal TermsInformal. a person who is very interested in something;
    enthusiast:a ski bum; a beach bum.
  3. Informal. an incompetent or worthless person:"Get another job, you bums,'' he yelled.

  1. Informal Terms Informal. to borrow (something) without a promise to return:[+ object (+ off + object)]Can I bum a cigarette (off you)?
  2. bum around, [no object][Informal.]to spend time or wander aimlessly:All vacation long we just bummed around.

adj. [before a noun][Slang.]
  1. of poor or miserable quality;
    worthless:a bum deal on that useless car.
  2. false or misleading: A bum rap is when you are falsely accused of something.
  3. lame: a bum leg.
  1. Idioms bum (someone) out, [+ object + out][Slang.]to disappoint, upset, or annoy:That test really bummed me out.

bum2 /bʌm/USA pronunciation   n. [countable] Brit. Slang.
  1. British Termsthe buttocks;
    rump:falling on his bum.

WordReference Random House Unabridged Dictionary of American English © 2020
bum1  (bum),USA pronunciation n., v.,  bummed, bum•ming, adj.,  bum•mer, bum•mest. 
  1. a person who avoids work and sponges on others;
  2. a tramp, hobo, or derelict.
  3. [Informal.]an enthusiast of a specific sport or recreational activity, esp. one who gives it priority over work, family life, etc.:a ski bum; a tennis bum.
  4. [Informal.]an incompetent person.
  5. a drunken orgy;
  6. on the bum, [Informal.]
    • living or traveling as or in a manner suggesting that of a hobo or tramp.
    • in a state of disrepair or disorder:The oven is on the bum again.

  1. [Informal.]to borrow without expectation of returning;
    get for nothing;
    cadge:He's always bumming cigarettes from me.
  2. [Slang.]to ruin or spoil:The weather bummed our whole weekend.

  1. to sponge on others for a living;
    lead an idle or dissolute life.
  2. to live as a hobo.
  3. bum around, [Informal.]to travel, wander, or spend one's time aimlessly:We bummed around for a couple of hours after work.
  4. bum (someone) out, [Slang.]to disappoint, upset, or annoy:It really bummed me out that she could have helped and didn't.

adj. Slang. 
  1. of poor, wretched, or miserable quality;
  2. disappointing;
  3. erroneous or ill-advised;
    misleading:That tip on the stock market was a bum steer.
  4. lame:a bum leg.
  • 1860–65, American; perh. shortening of or back formation from bummer1; adjective, adjectival senses of unclear relation to sense "loafer'' and perh. of distinct origin, originally
    • 2.See corresponding entry in Unabridged vagabond, vagrant.

bum2  (bum),USA pronunciation n. [Chiefly Brit. Slang.]
  1. British Termsthe buttocks;
  • 1350–1400; Middle English bom; of uncertain origin, originally

bum3  (bum),USA pronunciation n. [Mil. Slang.]
  1. Militarya reproduction of a document made with copying equipment.
  2. Militarya bag into which classified waste is put in preparation for destruction.
  • def. 2 presumably as shortening of bum bag perh. as shortening of bumf or bumfodder

Collins Concise English Dictionary © HarperCollins Publishers::
bum /bʌm/ n
  1. Brit slang the buttocks or anus
Etymology: 14th Century: of uncertain origin
bum /bʌm/ informal n
  1. a disreputable loafer or idler
  2. a tramp; hobo
vb (bums, bumming, bummed)
  1. (transitive) to get by begging; cadge: to bum a lift
  2. (intransitive) often followed by around: to live by begging or as a vagrant or loafer
  3. (intransitive) usually followed by around: to spend time to no good purpose; loaf; idle
  4. bum someone offUS Canadian slang to disappoint, annoy, or upset someone
  1. (prenominal) of poor quality; useless
Etymology: 19th Century: probably shortened from earlier bummer a loafer, probably from German bummeln to loaf
'bum' also found in these entries:

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