[gohld-brik for 1, 2; gohld-brik for 3–5]
verb (used without object) Slang.
to shirk responsibility or perform halfheartedly; loaf.
verb (used with object)
to swindle; cheat.
Origin of goldbrick
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
"shirker," 1914, World War I armed forces slang, from earlier verb meaning "to swindle, cheat" (1902) from the old con game of selling spurious "gold" bricks (attested by 1882).
Online Etymology Dictionary, © 2010 Douglas Harper