Definition of tat noun from the Oxford Advanced Learner's Dictionary



BrE BrE//tæt//
; NAmE NAmE//tæt//
[uncountable](British English, informal)
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goods that are cheap and of low quality see also tit for tat Word Origin mid 19th cent. (in the senses ‘rag’ and ‘person in rags’): probably a back-formation from tatty.