If the (recently added) part-of-speech tagging on Google Books is accurate, the chronology is the other way around: it used to be equally used as a noun and ver

If the (recently added) part-of-speech tagging on Google Books is accurate, the chronology is the other way around: it used to be equally used as a noun and verb, but sometime in the 1990s the verb form became dominant: http://books.google.com/ngrams/graph?content=schlep_VERB%2Cschlep_NOUN&year_start=1900&year_end=2008&corpus=15&smoothing=3&share= http://books.google.com/ngrams/graph?content=schlep_VERB%2Cs...