Incentive and Sitting duck

Incentive noun - Something that arouses action or activity.

Sitting duck and incentive are semantically related. In some cases you can use "Sitting duck" instead a noun "Incentive".

Sitting duck noun - A person or thing that is the object of abuse, criticism, or ridicule.

Incentive and sitting duck are semantically related. Sometimes you can use "Incentive" instead a noun phrase "Sitting duck".