sugar-plum noun 6verb 1forms 4 noun6 •A round or oval sweet/piece of candy made of boiled sugar. •Term of endearment: sweetheart, darling. •The prune plum. •(old-fashioned) A piece of flattery. •The fruit of this tree. •Uapaca kirkiana, an southern African fruit tree. verb1 •(informal) to daydream formssugar-plummed · sugar-plumming · sugar-plums · sugar plums