As a Noun: 1. Your lips, or the space behind your lips where your teeth and tongue are. You use it for eating, speaking and making facial gestures. English = mouth. 2. The action of making facial gestures with your mouth, or of forming words with your lips without making any sound. English = mouthing. As a Verb or Adjective: 1. To form words with your lips without making any sound. English = mouth. 2. To make facial gestures with your mouth without saying words or making any sounds. English = mouth.