In phonetics and phonology, a bilabial stop is a type of consonantal sound, made with both lips, held tightly enough to block the passage of air. The most common sounds are the stops and, as in English pit and bit, and the voiced nasal. More generally, several kinds are distinguished:, voiceless bilabial plosive , voiced bilabial plosive , voiced bilabial nasal , voiceless bilabial nasal , voiced bilabial implosive , bilabial ejective (rare) or, voiceless bilabial implosive