AMP noun 4phrases 2 noun4 •Initialism of adenosine monophosphate. •(Internet) Initialism of accelerated mobile page. •Initialism of antimicrobial peptide. •Initialism of Asian massage parlor. Phrases with AMP amp downTo calm down; to speak or behave more quietly; to reduce the energy of (something). amp upTo amplify; to increase the power, interest, intensity, volume, etc. of (something).