Phrases with "know":
* "Know your onions": Means to be knowledgeable or skilled in a particular area.
* "Know the ropes": Means to understand the procedures and workings of something.
* "Know what's what": Means to be well-informed and able to make good judgments.
* "Know the score": Means to be aware of the situation or facts.
* "Know better": Means to be aware that something is wrong or inappropriate.
Phrases with "knowing":
* "A knowing look": A look that suggests the person understands something that others may not.
* "With a knowing smile": A smile that suggests the person knows something secret or amusing.
While not strictly idioms, these phrases all express a similar concept to idioms – using a figurative way of speaking to convey a specific meaning.
Other idioms that relate to knowledge:
* "A little knowledge is a dangerous thing": Means that having limited knowledge can lead to mistakes or bad decisions.
* "Ignorance is bliss": Means that it is better to be unaware of something unpleasant.
* "The more you know...": A common phrase that suggests that learning new things is always beneficial.
It's worth noting that these phrases might not be considered "true" idioms, but they do function in a similar way by using figurative language to convey meaning.