碍于 Traditional form: 礙於 Pinyin (reading): àiyú Definitions: to be constrained by; due to (a constraining factor) Characters: 碍 - to block, to deter, to hinder, to obstruct 于 - at, in, on; to, from; alas! Traditional characters: 礙 - to block, to deter, to hinder, to obstruct 於 - at, in, on; to, from; alas!