Sentence:  “Baby, watch out for the <WSD>undertoad</WSD>.” I just had this vision of this big toad out there waiting to grab me and take me off to Cuba. She kept saying the <WSD>undertoad</WSD> was in the water. 
Meaning of the word marked with <WSD> tags:  A mythical monster that lurks underwater to catch unwary swimmers; a personification of an undertow.