BT Yom 87a(46) :שמע ר׳ אבא נפק אבתריה‏ : PN heard and went out after him
See the entire entry for ˀbtr prep. after

BT Yom 87a(46) :השתא ודאי אנא מחייבנא למיפקא לך אדעתך‏ : now I am truly obligated to appease you
See the entire entry for dˁt n.m. knowledge