To inform somebody, especially to supply someone missing or missed information.
To substitute for somebody or something.
To complete a form or questionnaire with requested information.
To beat up; to physically assault.
To fill; to replace material that is absent or has been removed.
To find time or space for, amid other things.
Used other than figuratively or idiomatically: see work, in.
To work out using a machine in between the sets of someone who is already using that machine.