the.com/happy hour

means A period, usually in the late afternoon or early evening, when a bar or restaurant sells drinks and sometimes food at reduced prices.

from The phrase surfaced in U.S. Navy slang in the early 20th century, where a "happy hour" was a scheduled stretch of onboard entertainment — boxing, music, films — to break up the monotony of life at sea. By the mid-20th century it had drifted ashore and into bars, attaching itself to the cheap-drinks slot it owns today. The escape from tedium stayed; only the venue changed.