'cashew-related' originates from modern English, formed by combining the noun 'cashew' and the adjective 'related' to mean 'related to cashews'.

'cashew' comes into English via Portuguese 'caju', ultimately from Tupi 'acajú' meaning 'nut that grows in a shell'; 'related' comes from Latin 'relatus' (past participle of 'referre') via Old French and Middle English, and the compound 'cashew-related' is a modern, transparent English formation.

Initially, 'cashew' referred specifically to the nut/tree; combining it with 'related' has the straightforward modern meaning 'connected to or concerning cashews', so there is little semantic shift in the compound itself.