Quid/kwɪd/ Definition 1 of 3Pro Tip 1/3Informal Currency Use 'quid' in casual conversations rather than formal financial contexts. Can you lend me twenty quid until tomorrow? Pro Tip 2/3Singular and Plural 'Quid' remains 'quid' in both singular and plural form, not 'quids'. I need to exchange these dollars for quid. Pro Tip 3/3UK Specific Understand that 'quid' is a term exclusively used in the UK. When I was in London, I spent about 100 quid on souvenirs.