Explications are a dissection of the poem, pulling out all of its parts and pinning down all of the beauty, meaning, and intentionality that you can find.
Don't be afraid to look up a word that is unfamiliar or that seems possibly out of place in lines of poetry! Consider this as a hint of impact, and utilize your resources. See below for online options for gaining an understanding of the meaning of a word and alternative or older uses for the word in question!
Poetry often benefits from taking into consideration the word choice of the poet. This is especially true for poems composed earlier in history. Words that stick out to you as being either used in an uncommon way, being an uncommon word, or simply for being an unfamiliar word, will benefit from being looked up in a dictionary, physical or digital.
Example: "Tell Tell all the truth but tell it slant —" by Emily Dickinson
The poem above was written sometime within Emily Dickinson's lifetime and published posthumously. Because this poem was not intended for publication, our only way to interpret her poetry is through our own devices.
The use of "infirm" in the 3rd line may benefit from closer examination. Merriam-Webster's website provides three definitions for Infirm; These definitions can change our understanding of what infirm might mean in this poem.
When I read this poem, I think of infirm as in being feeble, and therefore I interpret the line as telling me that the truth cannot be too harsh for the fragility of some individual's happiness.