(METAL) [noun] [U] - a very dense, soft, dark-grey, metallic element which is used on roofs and for protection against radiation. It is also poisonous.The lead pipes in many older houses have been replaced by copper ones.Some types of paint on toys might cause lead-poisoning (= an illness caused by lead) in children.If something goes down like a lead balloon, it is not popular or successful.Well, your suggestion that we work all weekend went down like a lead balloon.
LEAD
Meaning of LEAD in English
Cambridge English vocab. Кембриджский английский словарь. 2012