I n. letter; mail II v. believe; give credence to 我不信你的话。 I don't believe you. III b.f. 1) message; word; information (信儿, 信息) 2) confidence; trust; faith (信用) 3) sign; evidence (信号) 4) at will/random; without a plan (信口, 信步) 5) true (信史) 6) fuse (信管, 引信)