Vyskytuje se vmum: keep mumabout/on sth hovor. (po)mlčet o čem, neříct ani slovo o čemmum: Mum's the word!Nikomu ani muk!slovo: Nikomu ani slovo!Keep mum!, Mum is the word!muk: Nikomu o tom ani muk.Keep mum on it!, Mum's the word., Let's keep it secret.