keep in a certain state, position, or activity; e.g., "keep clean"
cause to open or to become open
retain possession of
continue a certain state, condition, or activity
stop (someone or something) from doing something or being in a certain state
start to operate or function or cause to start operating or functioning
affording unobstructed entrance and exit; not shut or closed
affording free passage or access
become open
with no protection or shield
