Translation is the process consisting in "reproducing in the receptor language the closest natural equivalent of the source-language message, first in meaning and secondly in style". It is a complicated process beset by many problems and difficulties. These problems may have been the main reason that made many people through ages reluctant to carry out translation. Since "no two languages are identical, either in the meanings given to corresponding symbols or in the ways in which such symbols are arranged in phrases and sentences", translation, which aims at conveying a message from the SL into the TL, is often accompanied by many linguistic problems: lexical, syntactic, semantic and stylistic. The article demonstrates various opinions and sample examples of the concretization, which means replacing a word with a broad sense by one of a narrower meaning, as a type of lexical substitution that denotes the words and stable word combinations are replaced by others which are not their equivalents.