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senioritis

American  
[seen-yuh-rahy-tis] / ˌsin yəˈraɪ tɪs /

noun

  1. Informal: Facetious. a decline in motivation or academic performance that supposedly afflicts some seniors in high school, especially in their last term.

Etymology

Origin of senioritis

First recorded in 1955–60; senior ( def. ) + -itis ( def. )

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

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