Sentence:  1 cup chili sauce 1 3 cup water 1 tablespoon barbecue sauce 2 teaspoons prepared mustard 1 2 pound chipped , spiced ham 6 sandwich buns , heated Combine first 4 ingredients in saucepan ; <WSD>heat</WSD> thoroughly . 
Meaning of the word marked with <WSD> tags:  make hot or hotter