[hot up] vi (1878) chiefly Brit: to increase in intensity, pace, or excitement "air raids began to hot up about the beginning of February --George Orwell" ~ vt, chiefly Brit: to make livelier, speedier, or more intense
HOT UP
Meaning of HOT UP in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012