ruin

1 ruin /ˈruːwən/ verb
ruins; ruined; ruining
1 ruin
/ˈruːwən/
verb
ruins; ruined; ruining
Britannica Dictionary definition of RUIN
[+ object]
1 
: to damage (something) so badly that it is no longer useful, valuable, enjoyable, etc. : to spoil or destroy (something)
2 
: to cause (someone) to lose money, social status, etc.
2 ruin /ˈruːwən/ noun
plural ruins
2 ruin
/ˈruːwən/
noun
plural ruins
Britannica Dictionary definition of RUIN
1 
[noncount] : a state of complete destruction : a state of being ruined
2 
[count] : the remaining pieces of something that was destroyed — usually plural
— sometimes used figuratively
3 
[noncount] : the state of having lost money, social status, etc.
4 
[singular] : something that badly damages someone physically, morally, economically, or socially

in ruins

: destroyed with some pieces or parts remaining — sometimes used figuratively