wigwag /wigˈwag/

1. To twist about
2. To signal by means of flags

1. The act of wigwagging
2. A level crossing signal that gives its indication, with or without a red light, by swinging about a fixed axis

Twisting

To and fro

• cost-effectiveness
• cost efficiency
• cost-efficient
• coster
• costermonger
• costermongers
• costers
• costes
• cost-free
• costing
• costive
• costively
• costiveness
• costivenesses
• costlier
• costliest
• costliness
• costlinesses
• costly
• costmaries
• costmary
• cost of living
• cost of living index
• cost plus
• cost-plus