Backswitch
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A word or phrase becomes another when its last letter is changed (or “switched”) and moved to the beginning, and the resulting letters are reversed (“turned back”). Examples: autumn, mutual; or dragnet, en garde.
In the switchback, a word or phrase becomes another when its first letter is changed (switched) and moved to the end, and the resulting letters are reversed (turned back). Example: hydra, tardy.
WILLz introduced the switchback and backswitch, based on an Italian puzzle type, at the 1980 convention.