amplify
v.to make something louder or stronger. You can use it for sounds or for making an idea more powerful.
v.to increase the volume of a sound or the intensity of an effect; to expand on a statement with more detail.
“The speakers amplify the sound of the guitar.”
“Social media can quickly amplify a small rumor until it becomes a major news story.”
“The author uses vivid imagery to amplify the sense of isolation felt by the protagonist throughout the novel's final chapters.”
The verb is transitive and requires a direct object.
“Together, they reflect our ambition to create a museum that amplifies community, creates new opportunities and helps define the future.”
“They used peppery spices to amplify or temper the key ingredients allowed them.”
From Middle English amplifiyen, from Old French amplifier, from Latin amplificare (“to enlarge”), from amplus (“large”) + facere (“to make”). See ample , equivalent to ample + -ify.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.