jumper, n.1 1. UK Und. uses. (2 subsenses) 2. in lit. uses, someone or something that jumps. (7 subsenses) 3. [early–mid-19C] a Scot. coin, worth 10 pence . 4. in fig. uses. (3 subsenses) 5. [1990s+] an injection or portion of a narcotic drug, esp. the first of the day . 6. [mid-19C; 2000s] a member of a fundamentalist Christian church. 7. a bank clerk. 8. see counter-jumper n. (1)