To turn up is to appear unexpectedly — or to raise the volume. Arrival and a dial, in the same two words.
The arriving sense is the commonest in British English, and turning up unannounced is a whole social offence. Things turn up too, since a lost item turns up eventually. The volume sense is the exact opposite of turning it down. There are two more: turning up a hem shortens a garment, and something turning up means an opportunity arriving, which is the whole philosophy of one famous Dickens character.
turn-up a deverbal from turn up.
Etymology from Wiktionary, CC BY-SA
Practised in Phrasal Verbs, A Man Called Ove
First appears in chapter 2 of A Man Called Ove.
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