I. ˈ ̷ ̷ˌ ̷ ̷ noun
Etymology: dead (II) + line
1. : a line drawn within or around a prison that a prisoner passes only at the risk of being instantly shot
2. : a line or mark made on the bed of a cylinder press to indicate the limit to which the printing surface may extend
3. : a fixed time limit : a date or time before which something must be done and after which the opportunity passes or a penalty follows
the deadline for filing income tax returns
specifically : the time limit after which copy is not accepted for use in a particular issue of a publication
3 a.m. was the deadline for the newspaper's morning edition
4. : a group of military vehicles put aside for repair or periodic maintenance
II. ˈ ̷ ̷ˌ ̷ ̷ transitive verb
: to put aside (as a motor vehicle) for repair or maintenance