Expressive means and stylistic devices

The author’s expressive style is created with the help of lexical expressive means and stylistic devices. They help a reader to understand the characterization of characters and the plot itself more vividly.

The metaphor bulldozing the grocer and the vegetable man and the butcher is used to underline how difficult the financial situation was and that Della didn't not just bargain but she did it insistently.
The repetition of the adjective grey  She stood by the window and looked out dully at a grey cat walking a grey fence in a grey backyard is used to show how hopeless situation seemed to be, and Della was disappointed because she made every effort and her savings were little.
The simile is used to describe Della’s greatest possession - her hair Della’s beautiful hair fell like a cascade of brown water. Such simile means that Della could be proud of her hair as not every woman has such beautiful hair.
The inversion  and anaphora are used to point out that her clothes is also poor On went her old brown jacket; on went her old brown hat.
After selling her hair, she became happy as she had enough money to buy the present to her husband, her mood is described with the help of the metaphor next two hours tripped by on rosy wings. The chain to the watch had to be perfect, because Jim's watch were very wonderful and valuable, it is pointed out due to the capitalization The Watch.
The anticlimax and repetition of the conjunction nor It was not anger, nor surprise, nor disapproval, nor horror, nor any of the sentiments that she had been prepared for are used to show that Della is nervous as she is afraid not to be loved by Jim.
The repetition in the sentence You don't know what a nice-what a beautiful, nice gift I've got for you is used to show that Della feels nervous and doesn't know what to say and how to behave.
The antithesis  And then an ecstatic scream of joy; and then, alas! a quick feminine change to hysterical tears and wails is used to underline that Della's emotions were double meaning.
Such epithets as dim eyes, serious sweetness, eyes were shining brilliantly are used to underline the mood of the main characters as it is described indirectly.
The hyperbole Maybe the hairs of my head were numbered," she went on with a sudden serious sweetness, "but nobody could ever count my love for you is used to show how great their love is and it's really boundless.
Colloquial and informal words bulldozing, oh. ain`t I, dandy; detached constructions Her Jim.; simple sentences I buy hair. Cut it off and sold it. are used to make the story true to life, easy to understanding and more expressive.