Here are some common phrases that use "ear to" and their meanings:
* Ear to ear: This phrase describes a wide smile, where someone's mouth stretches from one ear to the other.
* Ear to the ground: This phrase means to be aware of what is happening, especially regarding gossip or news. It suggests someone is actively listening to what others are saying.
* Ear to the wall: Similar to "ear to the ground", this phrase indicates someone is listening closely to hear what others are saying, often in a secret or sneaky way.
* Lend an ear to: This phrase means to listen attentively to someone, to give them your time and attention.
To understand the meaning of "ear to", you need to look at the rest of the phrase it's used in.