Black Fiveday noun [C, usually singular]
/blæk ˈfaɪv.deɪ/
the five-day period around Thanksgiving, when shops reduce the price of goods in order to attract customers

But part of the reason for the soaring spending figures is because retailers are stretching the November promotional period for longer than ever before. Last year saw the introduction of the ghastly “Black Fiveday” to festive vocabulary as retailers started to discount from five consecutive days from the Thursday before to “Cyber Monday”.
[Sunday Telegraph, 19 November 2017]

doorbuster noun [C]
UK /ˈdɔː.bʌs.təʳ/ US /ˈdɔːr.bʌs.tɚ/
an article that is sold very cheaply in order to attract customers into a shop and make them buy other, more expensive, things

This year, in-store deals may not be quite as limited because Walmart has more than tripled the number of products available compared with last holiday season. The retailer has even done away with the wristband system used to manage its high-demand, low-supply doorbuster items.
[Yahoo! Finance, 21 November 2017]

golden quarter noun [C]
UK /ˌgəʊl.dᵊn ˈkwɔː.təʳ/ US /ˌgoʊl.dᵊn ˈkwɔːr.t̬ɚ /
the three-month period from October to December when retailers usually make the most profit

“October marked yet another reversal of fortunes for retailers, reinforcing just how volatile consumer spend has been,” said Paul Martin, head of retail at KPMG. “Despite the positive picture last month, these latest figures will be a real disappointment and not the start to the golden quarter retailers had hoped for.”
[www.telegraph.co.uk, 7 November 2017]

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