In human speech, egressive sounds are sounds in which the air stream is created by pushing air out through the mouth or nose. The three types of egressive sounds are pulmonic egressive (from the lungs), glottalic egressive (from the glottis), and lingual (velaric) egressive (from the tongue). The opposite of an egressive sound is an ingressive sound, in which the airstream flows inward through the mouth or nose.
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Pulmonic egressive in the context of Implosive consonant
Implosive consonants are a group of stop consonants (and possibly also some affricates) with a mixed glottalic ingressive and pulmonic egressive airstream mechanism. That is, the airstream is controlled by moving the glottis downward in addition to expelling air from the lungs. Therefore, unlike the purely glottalic ejective consonants, implosives can be modified by phonation. Contrastive implosives are found in approximately 13% of the world's languages.
In the International Phonetic Alphabet, implosives are indicated by modifying the top of a letter (voiced stop) with a rightward-facing hook: bilabial ⟨ɓ⟩, alveolar ⟨ɗ ⟩, retroflex ⟨ᶑ ⟩ (this letter is 'implicit' in the IPA), palatal ⟨ ʄ ⟩, velar ⟨ɠ ⟩ and uvular ⟨ʛ ⟩.
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