transitive verb
1.
a. : to make (typeset matter) continuous without a paragraph or other break
b. : to insert as additional matter
c. : to give paragraph indention to (a subhead) and make part of the running text
d. : to load (matrices) into a typesetting machine in which matrix distribution is automatic
2. : to arrest for a minor offense
got drunk the other night and the coppers run me in — Carl Sandburg
run in for speeding
3. : to operate (a newly built machine) long enough and at the proper speeds to cause the bearing surfaces to so wear that the machine may be satisfactorily operated under service conditions
intransitive verb
1. of typeset matter : to come short of filling the estimated space
2. : to pay a casual visit
lived close by and was used to running in whenever he liked