WordReference Random House Learner's Dictionary of American English © 2015
ru•in /ˈruɪn/USA pronunciation
v. [~ + object]
to reduce to ruin; destroy:Her smoking is ruining her health.
to bring to financial ruin; bankrupt:Another lawsuit like that and I'll be ruined.
ru•in•a•tion /ˌruɪˈneɪʃən/USA pronunciationn. [uncountable]
- ruins, [plural] the remains of a building, etc., destroyed or in decay:the ruins of Troy.
- [countable] a destroyed or decayed building, etc.:toured the ruin of the apartment house after the earthquake.
- [uncountable] a fallen, wrecked, or decayed condition:The house fell into ruin.
- [uncountable] the complete loss of health, means, money, etc.:We'd sunk into financial ruin.
- [uncountable] something that causes a downfall or destruction:Alcohol was his ruin.
Collins Concise English Dictionary © HarperCollins Publishers::
ruin /ˈruːɪn/ n
- destroyed or decayed building or town
- the state or condition of being destroyed or decayed
- loss of wealth, position, etc, or something that causes such loss; downfall
- something that is severely damaged: his life was a ruin
- a person who has suffered a downfall, bankruptcy, etc
- archaic loss of her virginity by a woman outside marriage
Etymology: 14th Century: from Old French ruine, from Latin ruīna a falling down, from ruere to fall violently
- (transitive) to bring to ruin; destroy
- (transitive) to injure or spoil: the town has been ruined with tower blocks
- (intransitive) archaic or poetic to fall into ruins; collapse
'ruin' also found in these entries: