BT Tan 29b(3) :אב דריע מזליה‏ : the month of Ab, whose horoscope is unsound
See the entire entry for ryˁ adj. shaken

BT Tan 29b(3) :דריע מזליה לישתמיט ליה‏ : (the month Av's) destiny is uncertain, so let him postpone
See the entire entry for šmṭ vb. to draw out