Etymology

Bob's your uncle

Today it means: No problem, the solution is simple, there you have it, it's that easy, you have what you want, all will be well: indicates a desirable conclusion has been reached with ease. Full definition →

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The story

Unknown. Several unsupported theories exist about its origin. A common explanation, involving Arthur Balfour gaining a promotion through the supposed intercession of his uncle, Prime Minister Robert Gascoyne-Cecil, is doubted because the expression did not appear in print until 1924.

Etymology from Wiktionary, CC BY-SA 4.0.