/suy"ding/ , n.
1. a short railroad track, opening onto a main track at one or both ends, on which one of two meeting trains is switched until the other has passed.
2. any of several varieties of weatherproof facing for frame buildings, composed of pieces attached separately as shingles, plain or shaped boards, or of various units of sheet metal or various types of composition materials.
[ 1595-1605; SIDE 1 + -ING 1 ]