Verb
(intransitive) To begin tracking a target via an automated system.
(transitive) To cause a missile to track (a target).
Source: en.wiktionary.orgMake the sign of the cross as often as possible! The cross is like a lock on a door. Food should also be blessed with the cross. Protect and save yourself with the power of the Holy Cross. Matrona of Moscow
. . . there warn't anybody at the church, except maybe a hog or two, for there warn't any lock on the door, and hogs likes a puncheon floor in summer-time because it's cool. If you notice, most folks don't go to church only when they've got to but a hog is different. Mark Twain
Neither party has God on its side, a monopoly on good ideas, or a lock on any single fiscal, social, or moral philosophy. Michael Bloomberg
Any time someone puts a lock on something you own against your wishes, and doesn't give you the key, they're not doing it for your benefit. Cory Doctorow
Never to lie is to have no lock on your door, you are never wholly alone. Elizabeth Bowen
The best place to meditate is on the pot. If you have a comfortable toilet seat and a stout lock on the door, there's no telling what great thoughts might emerge. Martin Luther dreamed up Protestantism whilst sitting on the toilet at Wittenburg monastery, and we know what a big movement that became. Anton LaVey