a wild plant growing where it is not wanted that prevents crops or garden flowers from growing properly:
the constant battle against weeds
a plant without flowers that grows on water in a large green floating mass [↪ seaweed]
3 [countable] British English informal
someone who is weak:
Nigel's such a weed, isn't he?
in large numbers:
Cars clogged the roads like weeds.
cigarettes or tobacco
6 [uncountable] old-fashionedMDD
7 old useMX
black clothes worn by a woman whose husband has died