The Vietnamese word "cất đầu" can be understood as "to stand up" or "to lift one's head." It is often used in contexts where someone is physically standing up or raising their head, indicating alertness or attention.
In more advanced contexts, "cất đầu" can also imply a sense of confidence or readiness. For example, if someone is feeling down, and then they decide to "cất đầu," it may suggest they are ready to face challenges again.
While "cất đầu" mainly means "to stand up" or "to lift one's head," it can also be used metaphorically to show someone is becoming more active or engaged in a discussion.