underpeer

under- +‎ peer

underpeer (third-person singular simple present underpeers, present participle underpeering, simple past and past participle underpeered)

1. (archaic) To look beneath something.
   • 1589, George Puttenham, The Arte of English Poesie, volume 3, page 128:

     Midsommer pageants in London, where to make the people wonder, are set forth great and uglie gyants marching as if they were alive, and armed at all points, but within they are stuffed full of browne paper and tow, which the shrewd boyes, underpeering, do guilefully discover, and turne to a greate derision.