Interrupt a rest period (5)
I believe the answer is:
break
I believe this is a double definition.
'interrupt' is the first definition.
('break' can be a synonym of 'interrupt')
'a rest period' is the second definition.
(I've seen this before)
(Other definitions for break that I've seen before include "Vacation; snap" , "Holiday - destroy" , "Fracture; holiday" , "that a billiards player wants as high as possible?" , "Shatter; respite" .)