Dictionary definition · bum
noun
- a person who is deemed to be despicable or contemptible"only a rotter would do that"
- a vagrant"a homeless tramp"
- person who does no work"a lazy bum"
- the fleshy part of the human body that you sit on"he deserves a good kick in the butt"
verb
- ask for and get free; be a parasite
- be lazy or idle"Her son is just bumming around all day"
adjective
- of very poor quality; flimsy
Source: Open English WordNet (CC BY 4.0).