בראשית מ:יא פירוש: רש״י, רשב״ם, רד״ק וRav Hirsch

ואשחט translate it as the Targum AND I PRESSED — The word occurs frequently in the Mishna (but only here in the Bible).

ואשחוט, I squeezed.

וכוס...ואשחט, the word שחט signals closing something off. It occurs also in this sense in Shabbat 143 אין שוחטים את הפירות, that it is forbidden to squeeze the juice out of fruit on the Sabbath.