دأب1 دَأَبَ, (T, S, M, &c.,) aor. ـَ (T, M, A, K,) inf. n. دَأْبٌ (T, S, M, A, K) and دَأَبٌ (T, M, A, K) and دُؤُوبٌ, (T, S, M, A, K,) He strove, laboured, toiled, or exerted himself; (T, S, A, K;) and wearied himself, or became wearied; (S, A, K;) in his work, (S, A, K,) or in a thing, (T,) and in a journey or journeying; (T, A;) in which last case, دَأَبَتْ is said of a she-camel, (T,) or of a دَابَّة [or horse or the like]: (A:) or he held on, or continued, (M, and Bd in viii. 54,) in his work, and his way. (Bd ibid.) See also 4.Hence, اللَّيْلُ وَالنَّهَارُ يَدْأَبَانِ فِى اعْتِقَابِهِمَا (tropical:)  [The night and the day hold on their course in their alternating]. (A.) b2:  دَأْبٌ (K) and دُؤُوبٌ (TA) also signify The act of driving vehemently; and i. q. طَرْدٌ [the act of driving away, hunting, &c.]. (K, TA.) 4 ادأب, (T, S, M, &c.,) inf. n. إِدْآبٌ, (T,) He made another, (S, A, K,) his hired man, and his beast, (A,) to strive, labour, toil, or exert himself; (S, A, K;) he fatigued, or wearied, (T, S, A, K,) another, (S, K,) his hired man, (A,) and his beast: (T, A:) or he made another, and anything, to hold on, of continue: and ادأبهُ also signifies أَحْوَجَةُ إِلَى الدُّؤُوبِ [he made him to be in need of striving, &c.; or of holding on, or continuing]: (M:) and أَدَبُوا is used by a rájiz, but not necessarily by poetic license, for أَدْأَبُوا. (IAar, M.) b2:  [Hence,] ادأب السَّيْرَ [He pursued the journey laboriously, or with energy; or he held on, or continued, the journey]: (S, M, L, K, in art. مسد; and M and L in art. سأد:) and [in like manner] you say, سَيْرَنَا ↓ دَأَبْنَا [ for فِى سَيْرِنَا, or perhaps فى is omitted by inadvertence]. (TA in art. نحب.) دَأْبٌ (T, S, M, A, K) and ↓ دَأَبٌ (S, M, K) [both originally inf. ns. of 1: and hence,] (tropical:)  A custom, manner, habit, or wont: (A'Obeyd, T, S, M, K:) an affair, a business, or a concern: (Zj, T, S, A, K:) and a case, state, or condition: (Zj, * T, * S, * M, A, * K: *) and a deed, or work. (A.) You say, هٰذَا دَأْبُكَ (tropical:)  This is [thy custom, &c.:] thy affair, business, or concern: or thy case, state, or condition: and thy deed, or work. (A.) Zj says that كَدَأْبِ آلِ فِرْعَوْنَ [in the Kur iii. 9 &c.] means, accord. to the lexicologists, (assumed tropical:)  Like the case of the people of Pharaoh: but in his opinion, like the striving, labouring, or toiling, of the people of Pharaoh in their unbelief, and their leaguing together and aiding one another against Moses. (T.) دَأَبَ: see the next preceding paragraph.دَئِبٌ: see دَائِبٌ.رَجُلٌ دَؤُوبٌ عَلَى شَىْءٍ [A man who strives, labours, toils, or exerts himself, and wearies himself, or who holds on, or continues, with energy, to do a thing]. (M.) دَائِبٌ (TA, and so in a copy of the S,) and ↓ دَئِبٌ (TA, and so in two copies of the S,) Striving, labouring, toiling, or exerting himself, and wearying himself, in his work [&c.: or holding on, or continuing, therein: see the verb]. (S, TA.) b2:  [Hence,] لَيْلَةٌ دَائِبَةٌ [A hard, fatiguing, or continuous, night-journey]. (M and K in art. مرس.) b3:  And الدَّائِبَانِ (tropical:)  The night and the day; (S, A, K;) which [are so called because they] hold on their course (يَدْأَبَانِ) in their alternating. (TA.)