The term 'cause to yawn' can be solved by four different crossword solutions: BORE (4 letters), BORES (5 letters), GAPE (4 letters), and BOREDOM (7 letters). BORE is a verb meaning to cause someone to become uninterested or tired. BORES is the third person singular present form of the verb, meaning that someone is causing another person to become uninterested or tired. GAPE is a verb meaning to open one's mouth wide, usually in surprise or wonder. BOREDOM is a noun meaning a feeling of listlessness and dissatisfaction resulting from a lack of interest or excitement.