"I taste the food."
Translation:Mi gustumas la manĝaĵon.
The suffix "um" has no particular meaning but it has a function. It indicates that the meaning is only figuratively related to the meaning of the root. In practice it means that words with -um you might have to look up in the dictionary. Here are a few examples: kolo- neck; kolumo- collar malvarmo -cold (temperature) malvarmumo -a cold (illness)