Definition of must-buy in English:

must-buy

noun

US
  • An essential purchase; something, especially a manufactured item, which is advertised or widely regarded as a highly desirable acquisition. Also attributive or as adjective Compare "must-have [adjective]".

Origin

1930s; earliest use found in The Chronicle-Telegram. From must- + buy.

Pronunciation

must-buy

/ˈmʌstbʌɪ/