Amplify (verb)

1. Increase the volume of (a sound), especially using an amplifier.
2. Make (something) greater in amount, power, or scope.

Origin:

Late middle english (in the sense "increase the size of something"): from latin amplificare, from amplus "large" + facere "make".

Examples:

1. He amplified the sound by turning up the volume.
2. The scientist amplified the signal to make it stronger.
3. The band amplified their music for the concert.
4. The company amplified its efforts to reach new customers.
5. The speaker amplified her point by providing more evidence.