maintain a required pace or level
lengthen or extend in duration or space
keep in a certain state, position, or activity; e.g., "keep clean"
continue a certain state, condition, or activity
retain possession of
stop (someone or something) from doing something or being in a certain state
conform one's action or practice to
look after; be the keeper of; have charge of
stick to correctly or closely
spatially or metaphorically from a lower to a higher position
