Kōrero anō means: Say that again.
Anō is another example of a particle which typically lives in the postposed periphery. Its most common use is to roughly mean ‘again’ or that an event should be repeated.
In the example of ‘horoia anō’ some speakers will make anō undergo ‘agreement’ with the passive and make it passive as well for “horoia anōtia”.
Sometimes it can be used similarly to ‘yet’ when talking about timeframes:
This ‘yet’ form is the manner anō is being used in when negating ‘kua’ sentences with “kāore anō… kia..”