swing-by(redirected from swing-bys)
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n. pl. swing-bys
A maneuver in which a spacecraft uses the gravitation of a planet or other celestial body to effect changes in its course and speed as it passes by.
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.
a trajectory that uses the gravitational field of one celestial body to alter the course of a spacecraft destined for another body.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.