brooch UK /bɹəʊtʃ/US /bɹoʊt͡ʃ/noun 2verb 1forms 3 noun2 •A piece of ornamental jewellery having a pin allowing it to be fixed to garments worn on the upper body. •A painting all of one colour, such as a sepia painting. verb1 •To adorn as with a brooch.Not the imperious show / Of the full-fortuned Caesar ever shall / Be brooch'd with me. — 1606 formsbrooched · brooching · brooches