اِنْتَصَفَ الشّيْءُ: بَلَغَ نِصْفَهُ to reach its midst, be in the middle, be midway, be half over

اِنْتَصَفَ مِنْ: طَلَبَ مِنْهُ الإنْصَافَ to appeal to for justice, seek or demand justice from

اِنْتَصَفَ مِنْ: اِنْتَقَمَ to take vengeance or revenge on, revenge oneself on, avenge oneself on