flat as a tack

(as) flat as a tack

Demoralized or unenergetic. She's been flat as a tack ever since she heard that she didn't get into her top choice school. This gray, cold winter weather just leaves me feeling flat as a tack. Good luck getting Paul to help you right now—he's always flat as a tack before having his morning coffee.

See also: flat, tack

Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.

flat as a tack

in very low spirits or lacking in energy. informal

The idea underlying the expression is of a tack that has been hammered in so that none of it protrudes.

See also: flat, tack

Farlex Partner Idioms Dictionary © Farlex 2017