bounds
noun 
baʊndz 
baʊndz [plural]
the accepted or furthest limits of something
beyond/outside/within the bounds of decencyPublic spending must be kept within reasonable bounds.It was not beyond the bounds of possibility that they would meet again one day.His enthusiasm knew no bounds (= was very great).Idioms
out of bounds
1 (in some sports) outside the area of play which is allowedHis shot went out of bounds.2 (North American English) not reasonable or acceptableHis demands were out of bounds.out of bounds (to/for somebody)
(especially British English) if a place is out of bounds, people are not allowed to go there see also off-limits
