The verse quoted is [Bereshis 37:29-30][1]: the requested word is

וַיָּ֤שׇׁב

with kamatz under ש. The kamatz does not have stress, and is known as kamatz katan, or a short vershion of kholam in the Babylonian pronunciation adopted by sephardim. It's "o" as in dog or fog.


  [1]: https://www.sefaria.org/Genesis.37.29?lang=bi&aliyot=0