مكس1 مَكَسَ, aor. ـِ (TK,) inf. n. مَكْسٌ, (Sh, A, K,) He diminished, or deducted from, a thing; (Sh, * A, * K, * TK;) syn. of the inf. n. تَقْصٌ. (Sh, A, K.) Thus Sh explains مَكْس in the saying of Jábir Ibn-Jinnee Et-Taghlibee: أَفِى كُلِّ أَسْوَاقِ العِرَاقِ إِتَاوَةٌ وَفِى كُلِّ مَا بَاعَ امْرُؤٌ مَكْسُ دِرْهَمِ [Is there bribing in every one of the markets of El-'Irák, and in the case of everything that a man has sold the deducting of a dirhem?]. (TA.) [Hence,] you say, مَكَسَ فِى البَيْعِ, aor.  and inf. n. as above; (S, Mgh, Msb, K;) and ↓ ماكس, inf. n.  مُمَاكَسَةٌ and مِكَاسٌ: (S, Mgh, Msb:) both  signify He diminished, or deducted from, the price in the selling, or buying: (Msb:) or both signify he desired, or demanded, a diminution of, or deduction from, the price in selling or buying: (Mgh, TA, *) or the former signifies he collected property in selling or buying: (K: [but from what I find in the other lexicons, I think it probable that an early copyist has perverted the text of the K here by making a transposition; writing مَكَسَ فِى البَيْعِ يَمْكِسُ مَكْسًا جَبَى مَالًا واَلمَكْسُ النَّقْصُ وَالظُّلْمُ  for مَكَسَ يَمْكِسُ مَكْسًا جَبَى مَالًا وَالمَكْسُ فى البَيْعِ النَّقْصُ وَالظُّلْمُ: in the TK we find جنى مالا, which is certainly a mistake:]) or مَكْسٌ signifies the diminishing (إِنْتِقَاص) of the price of a commodity: (M, TA:) and ↓ مِكَاسٌ, the acting with mutual niggardliness in bargaining; or, accord. to EshShereeshee, the vying in acuteness between a seller and buyer, the former demanding a price and the latter offering less, time after time, until they agree to a reduced price. (Har, p. 586.) You say also, مُكِسَ, meaning, He (a man) suffered a diminution, or deduction, in selling or buying and the like. (TA.) b2:  [Hence, perhaps, or the reverse may be the case,] He wronged a man; treated him, or used him, wrongfully, injuriously, or tyrannically. (A, * K, * TK. [In the first and second, only the inf. n. of the verb in this sense is mentioned.]) b3:  [Hence, also, app.,] He (the مَكَّاس, Mgh, Msb) collected a tax; syn. جَبَى; [particularly, the tax termed مَكْس:] (S, * M, Mgh, * Msb [in the first and third of which, only the inf. n. of the verb in this sense is mentioned:]) or he collected property. (A.) Hence the saying, (Mgh,) in a trad., (S,) لَا يَدْجُلُ صَاحِبُ مَكْسٍ الجَنَّةَ (S, Mgh) [The taker of the tax termed مكس will not enter paradise]; meaning, the عَشَّار. (TA.) 3 ماكس فِى البَيْعِ: see 1. b2:  ماكسهُ, (K,) inf. n. مُمَاكَسَةٌ [and مِكَاسٌ], (TA,) He acted with him in a niggardly, a tenacious, or an avaricious, manner; syn. شَاحَّهُ: (K: but in some copies, شَاكَسَهُ.TA,) or ماكسهُ فى البَيْعِ signifies he contended with him [by bidding against him or otherwise] in the sale. (MA.) [See, in art. كيس, voce كَاسَ, an ex. from a trad., accord. to one reading thereof.]6 تماكسا They acted in a niggardly, a tenacious, or an avaricious, manner, each with the other, in bargaining: (IDrd, K:) or تماكسوا فِى البَيْعِ they contended, one with another, [by outbidding or otherwise] in the sale. (MA.) مَكْسٌ, an inf. n., (see 1,) used as a subst., (Mgh, Msb,) Money that used to be taken from the seller of commodities in the markets in the time of ignorance: (IDrd, M, K:) and a dirhem which the collector of the poor-rate used to take after he had finished the receipt of that tribute: (IAar, K:) or what is taken by the عَشَّار, (S, Mgh,) or مَاكِس, (S,) or مَكَّاس: (Mgh, Msb:) so [accord. to some] in the verse above cited: (S:) the tax, or impost, which he used to take: (TA:) and generally, what the Sultán's guards  take wrongfully on an occasion of buying and selling: so [accord. to some] in the verse cited above: (Msb:) pl. مُكُوسٌ. (A, Mgh, Msb.) مَكَّاسٌ (A, Mgh, Msb) and ↓ مَاكسٌ (S) One  who takes, or receives, what is termed مَكْس: (Mgh, Msb;) i. e., (Mgh,) i. q. عَشَّارٌ. (S, Mgh.) مَاكِسٌ: see مَكَّاسٌ.