To suggest or entail a necessary contrary; have double and opposite application: Most often the claim of mental cruelty works both ways in a marriage/ I see your point, but don't you see it cuts two ways?
[originally fr the notion of a two-edged sword]
He said to himself that this was unreasonable; it was a poor rule that would not work both ways.
The rule must work both ways, or the argument falls to the ground.
But if motives are to be brought in question, the rule should work both ways.
An infinite supply of courtesy would, of course, be a priceless asset to him, but does not this work both ways?
Nor have I any objection to stating the same rule backward; for that is a poor rule that will not work both ways.
Perhaps it is upon the presumption that "it is a poor rule that will not work both ways."
Lehmann counsels the young voice to begin in the middle and work both ways.
It is a poor rule that will not work both ways, and your good health will leave you choleric and splenetic and exhausted.
In these, as in their predecessors, are striking cases of rules that work both ways.
If there's a duty owed between daughter and father, it ought to work both ways.