must-have adjective [only before noun]

used to say that sth is so good, interesting, useful, fashionable, etc. that people will want to own it:

Web access will soon become a standard, must-have feature for mobile phones.

Toy retailers complain that there isn't a must-have item this Christmas to help bring in shoppers.

a must-have accessory/feature/item/product

must-have noun [C]:

These shoes are a definite must-have this summer.

What are the latest trendy must-haves?

• fire sale
• firewall
• firing line
• firm
• firmware
• first class
• first-generation
• first half
• first in, first out
• first-line manager
• first mover
• first order of business
• first refusal
• first-round financing
• first section
• first tier
• first-tier supplier
• first-time
• fiscal
• fiscal drag
• fiscal policy
• fiscal year
• fishbone diagram
• fishery
• fish farm