(informal) "not knowing even a millimeter": completely ignorant in regards to something

a well-informed opinion / an opinion

cloakroom, checkroom

claim check, temporary deposit certificate

a lump sum paid when a civil servant retires before reaching the number of years necessary to receive a pension; one of the benefits of the Onkyu Law

leave, furlough / temporary layoff

layoff system

hit and run (the military technique of attacking one place and then quickly moving to another before defenders can react)

the best or top person, such as the best performer in a company, or a leading expert

Have a nice day!