tit for tat
noun /ˌtɪt fə ˈtæt/
/ˌtɪt fər ˈtæt/
[uncountable]- a situation in which you do something bad to somebody because they have done the same to you
- the routine tit for tat when countries expel each other’s envoys
- tit-for-tat assassinations by rival gangs