Part of Speech: Verb

Definition: bend one’s head or body forward and downward

Source: Words at Dictionary

Found in “Persephone, Falling” by Rita Dove, Line 3

“flowers, one unlike all the others!  She pulled, / stooped to pull harder”

The word “Stooped” means to bend one’s head. Although I have heard this word before it was difficult to put the definition in the line because it was a word that you seem to use but cannot exactly define it.