English

saphead

From sap + head.

A compound of sap + head

Proto-Indo-European *sap-

Proto-West Germanic *sap ‘sap, juice’

Old English sæp ‘juice, sap’

Middle English sap

English sap

Proto-Indo-European *kap- ‘head’

…

Proto-Germanic *haubudą ‘head’

Proto-West Germanic *haubud

Old English hēafod ‘head’

Middle English heed ‘head’

English head

Today it means

noun A simpleton, a stupid person.

Language periods are conventional ranges, not dates for this word.