ثقّلهُ

, verbal noun تَثْقِيلٌ, He, or it, made it, or him, ثَقِيل [i. e. heavy, properly and tropically]: (K:) تثقيل is the opposite of تَخْفِيفٌ; (S;) and signifies the making heavy in weight [&c.]; as also ثَقْلٌ [verbal noun of ↓ ثَقَلَهُ]. (KL.)

[Hence, (assumed tropical:) He made it (a word or a sound) heavy, or not easy, of utterance; or heavy to the ear: and particularly a word by uttering hemzeh with its true, or proper, sound, which is commonly termed تَحْقِيقُ الهَمْزَةِ, and opposed to تَخْفِيفُهَا; and by making a single consonant double; and by making a quiescent consonant movent: often occurring in these senses in lexicons and grammars: opposed to خَفَّفَهُ.]