What does the idiom listen closely mean?

"Listen closely" means to pay very careful attention to what someone is saying. It implies that the speaker is giving important information or instructions, and you should make a conscious effort to understand every detail.

Here are some synonyms for "listen closely":

* Pay attention

* Concentrate

* Tune in

* Be attentive

* Lend an ear

Example:

"Listen closely, I'm only going to say this once."