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melt in one's mouth

Taste very good, as in This cake is wonderful—it just melts in one's mouth. This expression, first recorded in 1693, at first alluded to the tenderness of some food that therefore did not require chewing, but it had acquired its present meaning by about 1850. Also see butter wouldn't melt.

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.