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turnabout

1 ENTRIES FOUND:
turnabout /ˈtɚnəˌbaʊt/ noun
plural turnabouts
turnabout
/ˈtɚnəˌbaʊt/
noun
plural turnabouts
Britannica Dictionary definition of TURNABOUT
[count]
: turnaround 2 usually singular often + in

turnabout is fair play

US
used to say that if someone does something to harm you it is fair for you to do something to harm that person