To move back and forth; sway; waver.To teeter; seesaw.To tremble.To laugh in a restrained or nervous manner, as from suppressed mirth, pleasure, or embarrassment; giggle; snicker.n. A restrained or nervous laugh; a giggle; a snicker. There's a titter of winds in that beechen tree.n. A weed, probably the hairy vetch. See tine.