(sometimes comparable) Having been run in to seat the parts.
(not comparable) Having been run in before or behind previous text.
To arrest; (especially) to track down and arrest.
To insert (a word, etc.) without making a line break or new paragraph (so that it is not free-hanging).
To use new machinery at less than full speed, preventing damage.
To start a new regime slowly.
To use new machinery at less than full speed, preventing damage. (transitive sense)
To score (a try).
To alter the position of matter to fill vacant space.