In typical intonation patterns, we stress the last content word in a phrase, which is sometimes the verb. But in a phrasal verb, the meaning is contained in the preposition which follows the verb, so it gets the stress instead

Phrasal verbs covered: run into, play along, walk through, look out for, read up on, hang in, write down, sing along, watch out, draw out, pull up, get up, build up

video with visuals: https://youtu.be/6u7LJQwsdPg