Though the various words which make up the idiom have their respective literal meanings, in the idiom they have lost their ( ) identity.
【正确答案】：INDIVIDUAL
【题目解析】：本题考查语义的整体性。individual——个别的，独特的。虽然组成习语的各个词都有各自的字面意思，但是在习语中，它们失去了各自的辨识度（初始的含义）。故答案为individual。
