Also found in: Dictionary, Thesaurus.
Related to buttoned-up: buttoned down
Very conservative, unimaginatively conventional, or old-fashioned, as of a person's clothing, attitude, behavior, or beliefs. He spent his entire adult life as a buttoned-up clerk, so, when he turned 65, he decided it was time for adventure.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.