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Từ điển tiếng Anh - Cambridge Advanced Learners Dictionary
on the back of an envelope
on the back of an envelope idiom
in a hurried way, without much detail
• The prices were very roughly calculated - it looked as though he'd done them on the back of an envelope.
Thesaurus+: ↑Hurrying and doing things quickly ↑Busy and active
Main entry: envelopeidiom
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