1) Material for Venetian blinds 2) Sound of flapping sails 3) Venetian blind material 
• (p. pr. & vb. n.) of Slat • Slats, collectively. • (n.) The violent shaking or flapping of anything hanging loose in the wind, as of a sail, when being hauled down.
Slat'ting noun The violent shaking or flapping of anything hanging loose in the wind, as of a sail, when being hauled down. Slat'ting Slats, collectively.