BT Ber 33a(15) :סק לאגרא ושדי דרגא מתחותך‏ : go up to the roof and throw down the steps beneath you
See the entire entry for mn@tḥwt prep. from below

BT Ber 33a(15) :סק לאגרא ושדי דרגא מתחותך‏ : go up to the roof and throw the ladder down from beneath you
See the entire entry for šdy vb. to throw (away or down)