IPA: //ˈfoʊtəʃɒp//
KK: /ˈfoʊtəˌʃɑp/
To edit or change a picture using computer software, often to improve its appearance or to create a different effect.
She decided to photoshop the image to make the colors more vibrant.
Past: photoshopped
Past Participle: photoshopped
Photoshop is formed from "photo-" (from Greek "phōtos", meaning light) and "shop" (from Old English "sceoppa", meaning a place of work or trade). The word refers to a place or software where images are manipulated using light.
Think of 'light' ('photo-') being worked on in a 'place' ('shop') — that's how Photoshop is all about editing images.