mum

Universal Words noun, adjective noun (BrE) (AmE mom) (informal) a mother: My mum says I can't go. * Happy Birthday, Mum. * A lot of mums and dads have the same worries. adjective IDIOMS keep mum (informal) to say nothing about sth; to stay silent: He kept mum about what he'd seen. mum's the word! (informal) used to tell sb to say nothing about sth and keep it secret