'Cupboard' was literally a board for cups — an open shelf, later enclosed, its 'p' now silent.
A piece of furniture or small recess with a door and usually shelves, used for storage.
A transparent compound: Old English 'cuppe' (cup) + 'bord' (board, plank, table). 'Cup' derives from Late Latin 'cuppa' (cup, tub, barrel), probably from Latin 'cupa' (tub, cask), from PIE *kup- (a hollow vessel). 'Board' from Old English 'bord' (plank, ship's side, table) from Proto-Germanic *burdam, from PIE *bherdh- (to cut) — a board was originally a cut plank. The compound first appears in the 14th century meaning a literal open shelf or sideboard on which cups were displayed — status-marking silverware visible to guests. Over the
A 'cupboard' was originally just a board (shelf) for cups — an open display table for showing off your best dishes. The 'p' in 'cupboard' is silent in modern pronunciation (/ˈkʌbəɹd/), which disguises the compound. 'Sideboard' followed the same pattern: a board placed to the side of the dining table for serving. And 'Mother Hubbard's cupboard' was bare — no cups on her board.