An expression meaning that the opposite case or converse is also true (i.e., 'the reverse is also the case').
親が子に期待するように、逆もまた然りで、子も親に期待することがある。
Just as parents expect things from their children, the reverse can also be true: children sometimes expect things from their parents.
言う側の気持ちがわかるなら、聞く側の気持ちも考えるべきだ。逆もまた然りだ。
If you understand the speaker's feelings, you should also consider the listener's feelings. The converse is also true.
ある方法で成功する場合があるが、逆もまた然りで、成功する例は状況によって異なる。
A method may work in some cases, and vice versa — success depends on the situation.