Yawn is an expression of tiredness or BOREDOM, often accompanied by an open mouth and deep inhalation of breath. The crossword solutions for the term 'yawn' include 'BOREDOM' (7 letters), 'YAWP' (4 letters), 'ENNUI' (5 letters), 'GAP' (3 letters), 'CHASM' (5 letters), 'MEH' (3 letters), 'GAPE' (4 letters), 'hohum' (5 letters), and 'BORING' (6 letters). All of these words are related to the concept of being bored or uninterested in something. Additionally, 'imbored' (7 letters) is a modern slang term used to express BOREDOM.