BT BQ 98a(18) :שאפיה בשופינא חסורי חסריה‏ : (if ) he filed it down [i.e. the coin] with a file, he severely diminished its size
See the entire entry for ḥsr vb. to be lacking

BT BQ 98a(18) :והני מילי דמחייה בקורנסא וטרשיה אבל שאפיה בשופינא חסורי חסריה‏ : this situation is where he struck (the coin) with a hammer and flattened it, but if he rubbed it down with a file he definitely diminished it
See the entire entry for šwp vb. to smear; grind down

BT BQ 98a(18) :שאפיה בשופינא חסורי חסריה‏ : if he filed it down with a file, he surely diminished its size
See the entire entry for šuppīn, šuppīnā n.m. file