keep in a certain state, position, or activity; e.g., "keep clean"
continue a certain state, condition, or activity
cause to open or to become open
retain possession of
start to operate or function or cause to start operating or functioning
stop (someone or something) from doing something or being in a certain state
affording unobstructed entrance and exit; not shut or closed
conform one's action or practice to
become open
affording free passage or access
