[1960–65; under- + emphasis]This word is first recorded in the period 1960–65. Other words that entered Englishat around the same time include: buyback, deinstitutionalize, disco, parvovirus, proxemicsunder- is a prefixal use of under, as to indicate place or situation below or beneath (underbrush; undertow); lower in grade or dignity (undersheriff; understudy); of lesser degree, extent, or amount (undersized); or insufficiency (underfeed)