police cruiser

:  govern

:  to control, regulate, or keep in order by use of police

:  to make clean and put in order

:  the internal organization or regulation of a political unit through exercise of governmental powers especially with respect to general comfort, health, morals, safety, or prosperity

:  control and regulation of affairs affecting the general order and welfare of any unit or area

:  the system of laws for effecting such control

:  a vehicle that cruises: such as

:  squad car

:  a powerboat with facilities (such as a cabin and plumbing) necessary for living aboard —called also cabin cruiser