This is the 5490th most frequent Chinese word.
先不
"先不" means "for now, not" or "not for the time being."
'先不' is used here to indicate the current decision to temporarily postpone the discussion of a certain topic.
我们先不讨论这个问题。
Let's not discuss this issue for the time being.
In this sentence, '先不' expresses a temporary avoidance of an action, indicating precedence of another task.
他先不吃晚饭,因为他要完成工作。
He won't eat dinner for now because he needs to finish his work.
Here, '先不' suggests a decision to delay a planned activity due to current circumstances.