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Phrase(s): *soft as a baby’s bottom [and] soft as a baby’s backside; *soft as down; *soft as silk; *soft as velvet
Cliché very soft and smooth to the touch. (*Also: as ~.) • This cloth is as soft as a baby’s bottom. • The kitten’s fur was as soft as down. • Your touch is soft as silk. • This lotion will make your skin soft as velvet.
McGrawhill's American Idioms And Phrasal Verbs