An important part of toki pona philosophy is that the speaker must think about what something is at its core before they can talk about it. Fixed phrases for specific things (also known as lexicalizations) are frowned upon, as they sidestep that aspect, while also forcing other speakers to memorize such combinations and making it difficult to use them to refer to other things. Nonetheless, some lexicalizations do creep into common usage. This page aims to catalog them and provide ideas for alternatives (which doesn't mean you shouldn't try to think of your own).
↑Funnily enough, pu uses this as part of a call not to lexicalize, proposing ilo tawa from the perspective of a driver and kiwen tawa for a near-hit pedestrian.