The idiom "a smooth sea never made a skilled sailor" means that easy or comfortable situations do not necessarily make someone capable of handling difficult or challenging ones.

The idiom "if wishes were horses, beggars would ride" means that if something was possible or easy to do, then everyone would be able to do it. It's a commonly used expression to express frustration or disappointment that something isn't as easy or accessible as it should be.

The idiom "arm in arm" means to walk or move together closely, usually holding hands or being physically close to one another. It can also refer to someone who is an intimate friend or confidant.

The phrase "under the weather" is an idiom that means to be unwell or ill. It can also mean feeling out of sorts, not feeling well mentally or physically, or being sick.

The idiom "as calm as a toad in the sun" means to be completely relaxed, tranquil, and at ease. The figurative meaning of this idiom is that a person who appears calm and composed has no inner turmoil or discomfort.