Sentence:  The U.S. Postal Service says "<WSD>curb service</WSD>" will also be available tomorrow night so that taxpayers can drive up to the post office and hand the forms, in stamped envelopes, to postal employees. 
Meaning of the word marked with <WSD> tags:  An exchange, such as ordering and delivery of fast food, which occurs when a worker comes outside to interact with a customer who remains within his or her stopped vehicle.