honour killing
noun /ˈɒnə kɪlɪŋ/
  /ˈɑːnər kɪlɪŋ/
(US English honor killing)
 [countable, uncountable]- the murder of a relative, usually a girl or woman, because she has done something that is thought to bring shame on the family
- She was the victim of a so-called ‘honour killing’.
 - The minister vowed to push through new laws against honour killing.