o ‧ ver ‧ crowd ‧ ing /ˌəʊvəˈkraʊdɪŋ $ ˌoʊvər-/ BrE AmE noun [uncountable]
[ Word Family: noun : ↑ crowd , ↑ overcrowding ; adjective : ↑ crowded , ↑ overcrowded ; verb : ↑ crowd ]
when there are too many people or things in one place
relieve/ease/reduce overcrowding
There are plans to relieve overcrowding in the village.
the prison’s chronic overcrowding problem