The Lucky Four-Leaf Clover

Irish 3-leaf clover

According to St. Patrick's Day lore, Patrick used the three leaves of the shamrock to explain the Christian holy trinity (the Father, the Son, and the Holy Spirit) to the native Irish, and the shamrock is one of the major symbols of the holiday. 

So what is the origin of the four-leaf clover being considered lucky?

The most obvious reason is that most clovers have only three leaves, and finding a four-leaf clover is uncommon (about 1 in 5,000). Its scarcity makes it special and so a symbol of luck.

But historically, the Celts in Ireland believed four-leaf clovers had magical properties, offering protection against evil spirits and bad luck. 

Druids thought they could help detect and ward off bad omens.

Some early Christians appropriated that belief and linked the four leaves to the cross and saw them as a sign of God's favor.

Each leaf is said to represent something.
First leaf: Hope
Second leaf: Faith
Third leaf: Love
Fourth leaf: Luck

During the 19th century in Victorian britain, four-leaf clovers became a popular symbol of luck and love, often pressed into books or exchanged as tokens.

The idea of luck associated with four-leaf clovers has persisted over time, reinforced by pop culture, misinterpreted St. Patrick’s Day celebrations, and general folklore.

Feeling Under the Weather

How did  “feeling under the weather” come to mean that someone is not feeling well.

Sailors would rest under the bow of a ship if they became seasick during a voyage. This was the best place as it would protect the sailor from bad weather. Those who were ill were described as being under the weather,

Steal Your Thunder; Specious; Limelight;

Here's an origin that sounds specious to me. By the way, specious means superficially plausible, but actually wrong.  - which itself has a specious origin in late Middle English (in the sense ‘beautiful’) from the earlier Latin specious (fair).

I found that “steal your thunder” - which today means to take the attention or limelight away from someone. By the way, the term "limelight" comes from the discovery in the 1820s that heating calcium oxide with oxygen and hydrogen produces a brilliant white light. The light was used as a theatrical spotlight and to illuminate stages. 

Back to "steal your thunder" which is said to have a quite literal origin. In the 18th-century, playwright John Dennis wanted an authentic sound of thunder for his play. He invented a thunder-making machine, but his play flopped. Later, he learned that someone had seen his machine in action and made a similar one for another play. It was pretty much the same machine but was not credited with the invention. This other person had literally stolen his thunder.