The term 'let the air out' can be interpreted in several ways. The crossword solutions for this term are BURP (4 letters), SING (4 letters), EXHALE (6 letters), DEFLATE (7 letters), and EXHALED (7 letters), BLEED (5 letters). Burping is the act of releasing gas from the stomach through the mouth, usually with a sound. Singing is the act of producing musical tones with the voice. Exhaling is the act of breathing out air from the lungs. Deflating is the act of reducing the pressure of a gas or air by letting some of it out. Exhaled is the past tense of EXHALE. Bleeding is the act of losing blood from the body. All of these words relate to the idea of letting air out, either from the body or from an object.