Definition of line outs:
(n) :
an audio jack that produces an unamplified signal
(v) :
to take part in a sports event
(v) :
to appear in a lineout
(v) :
(intransitive) To line up; to form a line.
(v) :
(transitive, of a number, name, etc. on a list) To remove from effective inclusion on a list by crossing an item off.
(v) :
(transitive) To create (something, e.g. parking spaces, lanes in a road) by marking lines on asphalt.