optional, racket Example Sentence:

Somewhere along the line, holiday tipping went from an optional thank-you for a year of services to a Mafia-style protection racket.

⇑ Translate the sentence above by Google ⇑

Related: optional, racket

Prev: Real-time Optional System for Vehicle Scheduling of Logistics Distribution.

Next: A holiday isn't an optional extra. In this stressful, frantic world it's a must.