bum

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A tramp; a vagrant.
2. n. A lazy or shiftless person, especially one who seeks to live solely by the support of others.
3. n. An incompetent, insignificant, or obnoxious person: The batter called the pitcher a bum.
4. n. One who is devoted to a particular activity or milieu: a beach bum.
5. v. To live by begging and scavenging from place to place. Often used with around.
6. v. To loaf.
7. v. To acquire by begging; cadge. See Synonyms at cadge.
8. v. Slang To depress, dishearten, or dismay. Often used with out.
9. adj. Inferior; worthless: gave me bum advice; did a bum job of fixing the car.
10. adj. Disabled; malfunctioning: a bum shoulder.
11. adj. Unfavorable or unfair: got a bum deal on my final grade for the course.
12. adj. Unpleasant; lousy: had a bum time at the party.
13. idiom. on the bum Living as a vagrant or tramp.
14. idiom. on the bum Out of order; broken.
15. n. Chiefly British Slang The buttocks.

Century Dictionary and Cyclopedia

1. To make a hollow noise; boom; hum; buzz.
2. To rush with a murmuring sound.
3. 3. To guzzle; drink.
4. To sponge on others for a living; lead an idle or dissolute life.
5. To dun.
6. To spin (a top).
7. To strike; beat.
8. n. An imitative word expressive of a droning or humming sound, as that made by the bee; a hum.
9. n. A drink.
10. n. A drunken loafer; one who leads an idle, dissolute life; a bummer.
11. n. 4. A drunken spree; a debauch.
12. n. Hence A convivial meeting.
13. n. The buttocks; the part of the body on which one sits.
14. n. A bumbailiff; the follower or assistant of a bailiff.
15. Of poor quality; low-down: as, a bum show; a bum performance.

Wiktionary

1. n. The buttocks.
2. n. (rare, rare) The anus.
3. n. A person.
4. n. A hobo; a homeless person, usually a man.
5. n. A lazy, incompetent, or annoying person, usually a man.
6. n. A player, usually a man, who often or usually plays poorly.
7. n. A drinking spree.
8. v. To sodomize; to engage in anal sex.
9. v. To ask someone to give one (something) for free; to beg for something.
10. v. To behave like a hobo or vagabond; to loiter.
11. v. To wet the end of a marijuana cigarette (spliff).
12. v. To depress; to make unhappy.
13. adj. Of poor quality or highly undesirable.
14. adj. Unfair.
15. adj. Injured and without the possibility of full repair, defective.
16. adj. Unpleasant.

GNU Webster's 1913

1. n. The buttock.
2. v. To make murmuring or humming sound.
3. v. To borrow without intention of returning; to cadge; ; -- usually with inexpensive items as the object.
4. n. A humming noise.

WordNet 3.0

1. n. the fleshy part of the human body that you sit on
2. v. ask for and get free; be a parasite
3. v. be lazy or idle
4. n. a person who is deemed to be despicable or contemptible
5. n. a disreputable vagrant
6. n. person who does no work
7. adj. of very poor quality; flimsy.