Build up and Pumping up

Build up verb - To become greater in extent, volume, amount, or number.

Pumping up and build up are semantically related In some cases you can replace term "Pumping up" with "Build up", this phrasal verbs are similar.

Build up and pumping up are semantically related in blow up topic. Sometimes you can use "Build up" instead a verb "Pumping up", if it concerns topics such as activate, energize.