Edward William Lane, An Arabic-English Lexicon, ك

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5 تَكَلَّفَ أَمْرًا ذ He [undertook a thing, or an affair, as imposed upon him: or] took, or imposed, upon himself, or undertook, a thing, or an affair, [as a task, or] in spite of difficulty, trouble, or inconvenience; (Msb;) syn. تَجَتَّمَهُ: (S, K:) he constrained, or tasked, or exerted, himself, or took pains, or made an effort, to do a thing; meaning, a thing that was difficult, troublesome, or inconvenient, to him: or he affected, as a self-imposed task, the doing of a thing. (The Lexicons, passim: see تغزّل: and see كَلَّفَهُ أَمْرًا.) ― -b2- تكلّف صِفَةً He affected, or endeavoured to acquire, a quality. So in the explanations of verbs of the measure تَفَعَّلَ; as نَحَلَّمَ. (Sharh El-'Izzee, by Saad-ed-Keen.) ― -b3- Also, He affected, or pretended to have, a quality, not having it. So in the explanations of verbs of the measure تَفَاعَلَ, as تَجَاهَلَ: (idem:) [and sometimes in verbs of the measure تَفَعَّلَ also, as تَكَسَّرَ &c.]. And تَكَلَّفَ alone, He exercised self-constraint, or put himself to trouble or inconvenience. ― -b4- تَكَلَّفَ He affected what was not natural to him. ― -b5- تَكَلَّفَ He used forced efforts to do a thing, and to appear to have a quality. He affected, or endeavoured to do or acquire, &c.; he constrained himself to do, &c.; he applied himself, as to a task, to do a thing. تكلّف الشَّجَاعَةَ He made himself, or constrained himself to be, courageous; affected, or endeavoured to acquire, or characterize himself by, courage. ― -b6- تكلّف الشَّجَاعَةَ also, He acted, or behaved, with forced courage; endeavoured to be courageous. ― -b7- تكلّف فِى عَرَبِيَّتِهِ He used a forced, or affected, manner in his Arabic speech. ― -b8- تَكَلُّفٌ A straining of a point in lexicology. ― -b9- تَعَقَّلَ signifies He affected or endeavoured to acquire, intelligence; explained by تكلّف العَقْلَ: and تَعَاقَلَ, he pretended to be intelligent, not being really so. (S, art. عقل.) تَكَلُّفٌ in a verb of the measure تَفَعَّلَ is as above explained, signifying a desire for the existence of an attribute in one's self: in a verb of the measure تَفَاعَلَ it is different, and means the pretending to be or to do something which in reality one is not or does not; as in the instance of تَجَاهَلَ, he pretended to be ignorant, not being so in reality. (Sharh El-'Izzee, by Saad-ed-Deen.) تَكَلَّفَ كَذَا He did so purposely. ― -b10- تَكَلَّفَ He tasked himself. ― -b11- تَكَلَّفَ القَىْءَ He vomited intentionally. (TA, art. قىء.)