ruin /ˈɹuː.ɪn/verb 9noun 8forms 7phrases 2 verb9 •To destroy or render something no longer usable or operable.He ruined his new white slacks by accidentally spilling oil on them. •to do great harm to something such as a plan, a career or someone's healthMy car breaking down just as I was on the road ruined my vacation. •To make something less enjoyable or likeable.I used to love that song, but being assaulted when that song was playing ruined the song for me. •To destroy (e.g. a city) so as to leave ruins.By the fireside there are old men seated, / Seeing ruined cities in the ashes. — 1857 •To cause the fiscal ruin of; to bankrupt or drive out of business.With all these purchases, you surely mean to ruin us! •To reveal the ending of (a story); to spoil. •(historical) To seduce or debauch, and thus harm the social standing of.The young libertine was notorious for ruining local girls. •(slang) To make (someone) have a ruined orgasm. •(no longer used) To fall into a state of decay.Though he his house of polisht marble build, / Yet shall it ruine like the Moth's fraile cell — 1636 noun8 •[in the plural] The remains of a destroyed or dilapidated construction, such as a house or castle.The Veian and the Gabian towirs shall fall, / And one promiscuous ruin cover all; / Nor, after length of years, a stone betray / The place where once the very ruins lay. — 1705 •The state of being a ruin, destroyed or decayed.The monastery has fallen into ruin. •Complete financial loss; bankruptcy. •Something that leads to serious trouble or destruction.Gambling has been the ruin of many. •The act of ruining something. •A change that destroys or defeats something; destruction; overthrow.the ruin of health or hopes •(slang) Clipping of ruined orgasm •(no longer used) A fall or tumble.His ruin startled th’ other steeds. — 1611 formsruin'd · ruined · ruint · ruining · ruineth · ruins · ruinest Phrases with ruin rack and ruinComplete destruction. wrack and ruinComplete destruction.