lock-on
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lock-on
(lŏk′ŏn′, -ôn′)n.
The start of the automatic tracking of a target, as by a missile.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.