Meaning of CAGE in English

CAGE

[noun] [C] - a space surrounded on all sides by bars or wire in which animals or birds are kept, or something which is similar to this in form or purposeZoos are moving away from keeping animals in small cages.Richard's rabbit cage was kept in the yard.(figurative) When I was ill my room was my cage (= felt like a prison).

Cambridge English vocab.      Кембриджский английский словарь.