weigh one's words
weigh one's words {v. phr.}
To choose your words carefully; be careful to use the right words.
When a teacher explains about religion, he must weigh his words because his pupils may be of several different faiths.
When old Mr. Jones talked to the students about becoming teachers, he spoke slowly, weighing his words.
In a debate, a political candidate has little time to weigh his words, and may say something foolish.
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Source: A Dictionary of American Idioms
