Definition of Topsy from the Oxford Advanced Learner's Dictionary

Topsy

 
;
 
 
the character of a young black slave girl in the novel Uncle Tom’s Cabin by Harriet Beecher Stowe. Topsy has no parents and, when asked to explain this, she answers, ‚I ’spect I grow’d (= I expect I grew).’ People often mention Topsy when they are talking about something that seems to have grown quickly without being noticed
Once the arms race began, it just grew, like Topsy.
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