(all) in one whack

:  the whole amount, quantity, or extent of

:  as much as possible

:  every member or individual component of

:  wholly, quite

:  only, exclusively

:  just

:  the whole number, quantity, or amount :  totality

: used in such phrases as for all I know, for all I care, and for all the good it does to indicate a lack of knowledge, interest, or effectiveness

:  everybody, everything

:  the whole of one's possessions, resources, or energy

:  to strike with a smart or resounding blow

:  to cut with or as if with a whack :  chop

:  to get the better of :  defeat

:  a smart or resounding blow

:  the sound of or as if of such a blow

:  a critical attack