Entry from British & World English dictionary
Definition of undercrackers in English:
plural nounBritish informal
- It seems that the vast majority of men's undercrackers are quite dull and boring - lots of dull solid colours, and the occasional tartan or stripe - but nothing even approaching a mild version of jazzy.
- It's not much good having a go at someone for being uncultured when you're stood there in your undercrackers, really.
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