tight as a drum


Taut or close-fitting; also, watertight. For example, That baby's eaten so much that the skin on his belly is tight as a drum, or You needn't worry about leaks; this tent is tight as a drum. Originally this expression alluded to the skin of a drumhead, which is tightly stretched, and in the mid-1800s was transferred to other kinds of tautness. Later, however, it sometimes referred to a drum-shaped container, such as an oil drum, which had to be well sealed to prevent leaks, and the expression then signified “watertight.”

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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.