Start and Start up

Start

Start verb - Get off the ground.
Usage example: I start my day with a good breakfast

Start up is a synonym for start. In some cases you can use "Start up" instead a verb "Start".

Start up

Start up verb - Get going or set in motion.

Start is a synonym for start up in bring into being topic. You can use "Start" instead a verb "Start up".
Cite this Source
Start up and Start. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/start/start_up
Start & Start up. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/start/start_up>.
Start up or Start. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/start/start_up.
Google Ngram Viewer shows how "start" and "start up" have occurred on timeline