Aerospace. a trajectory that uses the gravitational field of one celestial body to alter the course of a spacecraft destined for another body.
Origin of swing by
1960–65, Americanism; noun use of verb phrase swing by
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for swing by
(preposition) informal to go somewhere to pay a visit
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012