To contrast with or provide a background that highlights something else, often through use of color or lighting; to enhance by contrast.

(bound form) to serve as a foil or to set off by contrast, as in 衬托 chèn​tuō

To place something underneath or inside for protection or shape, such as adding a lining to a garment or padding inside a box.

to hold up or support something from underneath with the palm of the hand or with a tray