What term refers to placing emphasis on a weak or offbeat?

The correct answer is: syncopationExplanation:Syncopation is a pressure on a usually unstressed beat or a missing beat where a stressed one would commonly be obliged. Syncopation is used in many skilled styles, including classical music, but it is necessary for such styles as reggae, ragtime, rap, jump colors, jazz and often in dub step.

Syncopation is the answer