To strengthen.
To accumulate, to pile up, to increase in stages.
To close up by building.
In solitaire card games, to place a card over another card of lower value. (e.g., place 5♦ over 4♣)
To erect; to construct.
To provide or make a supplement to something.
A vitamin, herbal extract or chemical compound ingested to meet dietary deficiencies or enhance muscular development.
Something added, especially to make up for a deficiency.
An additional section of a newspaper devoted to a specific subject.
An angle that, when added to a given angle, makes 180°; a supplementary angle.
A surcharge, additional cost, especially for food in a restaurant.
An extension to a document or publication that adds information, corrects errors or brings up to date.