To remain open or available – to be or become weak – to rise or increase rapidly or suddenly – a social or official position or standing, as in the armed forces.

To have an unfilled position – to lose vigor or vitality – to fall suddenly – a list, register, or catalog, esp. one containing the names of the persons belonging to a company, class, society, etc.

To ask honestly or earnestly – to remain or stay on in a place longer than is usual or expected – to improve – a list or itemized display, as of titles, course offerings, or articles for exhibition or sale, usually including descriptive information or illustrations.

To have an unsold item – to be ignored – to fall suddenly – a capacity for achievement or success.