by return
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by return (of post)
Through prompt mail correspondence back to the sender. Primarily heard in UK. Please indicate your interest in this offer by return of post.
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.
by reˈturn (of ˈpost)
(British English) using the next available post; as soon as possible: Please reply by return of post.Farlex Partner Idioms Dictionary © Farlex 2017