Present participle of expectorate; the act of coughing up and spitting out mucus from the lungs.
The present participle form of expectorate, formed by adding -ing to the base verb, creating a gerund or continuous verb form.
The -ing form shows action in progress—'the patient is expectorating' focuses on the ongoing process. In medical observation, this distinction matters: it describes what's happening right now, not just what happened.
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