BT Ber 2b(3) :טהר יומא, כדאמרי אינשי, איע̇רב ש̇משא ואידכי יומא‏ : the day has ended, as people say: the sun has set and the day has been made pure
See the entire entry for ṭhr vb. to be clean

BT Ber 2b(3) :איע̇רב ש̇משא‏ :
See the entire entry for ˁrb#5 vb. to set