to implement; to carry out; to execute; to run

license; permit

to enforce a law; law enforcement

dedicated; devoted; persistent; to persist in; to cling to; (Buddhism) attachment

to be on duty (of a security guard etc)

obstinate; stubborn; to fixate on; to cling to

to dispute; to disagree; to argue opinionatedly; to wrangle

extreme and inflexible; fixated; stubborn in clinging to a notion; (psychology) paranoid

receipt (written acknowledgement of receipt of an item)

to persist; to continue upholding; to persevere; to stick to sth; stubborn