Meaning:
The phrase "be sick" commonly means to vomit, which is when a person ejects the contents of their stomach through their mouth. This can happen for various reasons, such as eating something bad, feeling very ill, or drinking too much alcohol.
In more advanced contexts, "be sick" may also relate to feeling nauseous without actually vomiting. For example: - "I feel sick after that roller coaster ride."
Understanding the phrase "be sick" is important because it helps you express when someone is feeling unwell or has vomited.