tin god

tin god idiom
A self-important, dictatorial, petty person who imposes ideas, beliefs, and standards on subordinates. For example, The officials in these small towns often act like tin gods. The tin in this expression alludes to the fact that tin is a base metal with relatively little value. [Late 1800s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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