Sentence:  Once the <WSD>blooper</WSD> is around the spinnaker, let out the <WSD>blooper</WSD> sheet completely (which collapses the <WSD>blooper</WSD>), race the <WSD>blooper</WSD> sheet forward and reset on the other side. 
Meaning of the word marked with <WSD> tags:  A gaff-rigged fore-and-aft sail set from and aft of the aftmost mast of a square-rigged ship; a spanker.