The term 'bed support' can be summarized by the crossword solution 'SLAT', which is a four-letter word. A SLAT is a thin, narrow strip of material, such as wood or metal, that is used to support a bed mattress. Slats are typically placed between the bed frame and the mattress, providing additional support and stability for the mattress. Slats also help to evenly distribute weight across the bed, making it more comfortable to sleep on.