Often shops have sales and generally they put a big (usually red with white writing) sign with the word 'Sale' to advertise the fact. If that sign were to be in Irish, would it say 'Margadh' or something else?

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Maybe -
sladmhargadh

Margadh- on its own is usually "market". But you can use it in context to mean bargain -- fuair mé margadh maith.

Ar díol/le díol and ar lascaine (reduction)

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I have never seen díol used to express 'reduction in prices', usually díol is restricted to the 'act of selling' itself.

ar díol/ le díol 'for sale/ to be sold'

Sladmhargadh is what is usually seen on signs in Irish to denote 'Sale', i.e. reduction in prices.

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Please wait for corrections/ more input from other forum members before acting on advice

That's what I meant, but I wasn't sure what Saoirse wanted (for sale vs. on sale)

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Looking for the 'there is a sale on in this shop' type of sign. 'Sladmhargadh' would probably cost a lot more for a shop than 'Sale'! There's nothing simple....!

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Díolachán is another word as well for 'sale'.

In the dictionary there's also - díol fuílligh - for a clearance sale and - saor-reic - for a bargain sale.