I. verb
Etymology: line (IV) + up
intransitive verb
: to assume an orderly linear arrangement
line up for inspection
transitive verb
: to put into alignment: as
a. : to put in correct adjustment for smooth running or perfect fitting
b. : to arrange in a line
line the silverware up
c. : to assemble and make available
lined a lot of support up for the reform candidate
d. : to check, mark, or correct the position of printed matter on (a press sheet)
II. transitive verb
Etymology: line (II) + up
: to cover (a surface of a book's coverboard or backbone) by applying and affixing a liner