He took, or received, from him a pledge. (K.) [Or] ارتهنهُHe took, or received, it as a pledge: (JK, Mgh:) or ارتهنهُ مِنْهُhe took, or received, it from him; namely, a pledge. (Msb.)
2.
[Accord. to Freytag, ارتهنهُ بِهِ signifies He had him, or held him, as a pledge to him for it. And اُرْتُهِنَHe, or it, was given as a pledge. But for neither of these has he mentioned any authority.]