Karst is a name for a certain type of landscape where the bedrock is riddled with cracks, fissures and caves formed by water dissolving/eroding the bedrock. "Of karstic origin" would refer to something (probably geological) that has been shaped under similar circumstances like a karstic landscape has been formed.
The origin of the phrase 'dead easy comes from the English language. The term dead actually meant 'simple' or 'completely' and dates back to the 14th century with this usage.
The origin of the phrase massanutten is said to be unclear, but in an old Indian language it has the meaning "peaked mountain". Massanutten is a popular phrase, with a long history.
There is no such phrase as "eat you".
The phrase Chistes Mexicanos is of Spanish origin, it translates to Mexican jokes. One can find more translations for Spanish words from the following sources: Spanish Dict, Google Translate.
There is no such phrase. There is a word rampage. It is of Scottish origin, perhaps from RAMP, to rear up.
"on the rocks"
The Spanish for "I have put" is he puesto, could this be the origin?
fREIGHT oN bOARD
Origin: This phrase is from the mid-1800's and originally referred to Native Americans who were often at war with settlers about land rights. The expression meant 'going to war.'
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The phrase "the last straw" originates from the idiom "the straw that broke the camel's back," which refers to a seemingly minor or routine occurrence that triggers a disproportionate reaction due to the accumulation of previous stress. Just as a camel can carry a heavy load until one final straw causes it to collapse, this phrase describes a situation where a small event leads to a significant outcome.
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