Push the boat out
"To spend generously, especially to celebrate something."
Thought to come from the literal, communal effort of launching a boat: pushing a beached vessel out into the water took a group effort, and it became customary for whoever's boat it was to stand the group a round of drinks afterwards in thanks. By the early 20th century, "pushing the boat out" had become general British slang for spending freely on a celebration, whether or not any actual boat was involved.
Sources: Documented in British nautical and colloquial slang dictionaries from the early-to-mid 20th century.
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