Synecdoche - i can never remember it, but want to use it....

Synecdoche from Greek συνεκδοχη, "simultaneous understanding" (pronounced /sɪˈnɛkdəkɪ/) is a figure of speech in which:

a term denoting a part of something is used to refer to the whole thing, or
a term denoting a thing (a "whole") is used to refer to part of it, or
a term denoting a specific class of thing is used to refer to a larger, more general class, or
a term denoting a general class of thing is used to refer to a smaller, more specific class, or
a term denoting a material is used to refer to an object composed of that material.
Synecdoche is closely related to metonymy (the figure of speech in which a term denoting one thing is used to refer to a related thing); indeed, synecdoche is often considered a subclass of metonymy. It is more distantly related to other figures of speech, such as metaphor.

The use of synecdoche is a common way to emphasize an important aspect of a fictional character; for example, a character might be consistently described by a single body part, such as the eyes, which come to represent the character. This is often used when the main character does not know or care about the names of the characters that he/she is referring to.

Also, sonnets and other forms of love poetry frequently use synecdoches to characterize the beloved in terms of individual body parts rather than a whole, coherent self. This practice is especially common in the Petrarchan sonnet, where the idealised beloved is often described part by part, from head to toe.

The word "synecdoche" is derived from the Greek συνεκδοχή, from the prepositions συν- + εκ- and the verb -δέχομαι(accept), meaning originaly the acceptance of a part of the responsibility for something.

Examples where a part of something is used to refer to the whole:
"The ship was lost with all hands [sailors]."
"His parents bought him a new set of wheels [car]."
Similarly, "mouths to feed" for hungry people, "white hair" for an elderly person, "the press" for news media.
In nations, "Britain" is used to mean the entire United Kingdom, as Holland is for Netherlands.
Examples where the whole of something is used to refer to a part of it:
"Use your head [brain] to figure it out."
"Michigan [the government of Michigan] just passed a law addressing this problem."
Similarly, "body" for the trunk of the body, the "smiling year" for spring
Examples where a species (specific kind) is used to refer to its genus (more general kind):
"The cutthroats [assassins] there will as soon shoot a man as look at him."
"Could you pass me a Kleenex [facial tissue]?"
Similarly, "coke" for pop/soda, "castle" for home, "meat" or "bread" for food, "Judas" for traitor
Examples where the material from which an object is made is used to refer to the object itself:
"Those are some nice threads [clothes]."
Similarly, "willow" for cricket bat, "copper" for penny, "roof" for a house, "boards" for stage, "ivories" for piano keys, "plastic" for credit card, "the hardwood" for a gym floor, "pigskin" for football

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