don't sound them out in your mind.

don't sound them out in your mind.
don't sound them out in your mind.

don't sound them out in your mind.
don't sound them out in your mind.
sound out:
试探(意见),探听(口气)；摸底细;大声读出
因没有具体语境,无法确切判断这句话意思.
可能的意思是：
1 记住不要说出声来；
2 记住不要去试探他们（关于这个事情）.