what do mean by idiomatic expression?

Question

this office is invoking the territorial jurisdiction over the case as the incident initially transpired at East Royale Hotel, general Santos City where the victim was billeted and later his body was found lying at athe deep ravine at Sitio Tagunsale, Malalag, Davao Del Sur

Answer 1

i don't understand the connection between your question and the details you added. so, i opt to answer the question itself.

an expression whose meanings cannot be inferred from the meanings of the words that make it up.

example: the early bird gets the worm.

Answer 2

Idiomatic expressions can be just one word or a group of words. If you try to understand an idiomatic expression literally, in most cases, it will make very little sense. The objective of an idiom is to try to develop a new meaning that goes beyond the literal significance. this one is the example Bill is an old hand in the store.
(This means that Bill has a lot of experience in the store. An "old hand" refers to a person with experience.) idiomatic expressions are used in formal and informal language.

Answer 3

I don't know about the details of you question, but an idiomatic expression is an phrase that's only intelligible in certain languages or cultures.