The term 'Fill the Hold' refers to a job that involves loading cargo onto a ship. The two crossword solutions, STOW and LADE, are both verbs that mean to load or put something into a place for storage. STOW is an old-fashioned word that is still used in nautical contexts, while LADE is a more general term that can be used in any context. Both words refer to the same action of filling the hold of a ship with cargo.