Examples of idioms: Please subtract Mrs. Su Songtai's Floating Grain by Feng Guifen in the Qing Dynasty: "Officials who have always extorted money from others, the so-called people who knock on the bones and suck the marrow, have no bones to knock on and no marrow to suck."
Commonly used degree: commonly used
Emotional color: a derogatory term
Grammatical usage: as predicate, attribute and adverbial; derogatory sense
Idiom structure: continuous action
Generation time: ancient times
Idiom pronunciation: pith, you can't pronounce "suí".
The idiom distinguishes shape: pith, you can't write "sui".
Discrimination of idioms: there is a difference between tapping bones and sucking marrow and "extorting blood": tapping bones and sucking marrow is more cruel; Its means can be varied; "Cross-taxation and extortion" pays attention to violence; Its means only refers to the collection.
Idiom riddle: eat crab legs