Cal-xo-pho-bia
* Cal: Like "call" but with a shorter, more clipped sound.
* xo: Like "ox" but with a softer "x" sound.
* pho: Like "foe" but with a shorter, more clipped sound.
* bia: Like "bee-uh"
You can also break it down into syllables: Cal-xo-pho-bi-a.
It's important to remember that "calxophobia" is a rare word, so even if you pronounce it perfectly, many people may not be familiar with it.