ثءب

1 ثُئِبَ ذ , ('Eyn, T, M, K,) like عُنِىَ, (K,) and ثَئِبَ, (IKoot, L, and so in a copy of the A,) inf. n. ثَأْبٌ, (K,) or ثَأَبٌ, (M,) He became relaxed and sluggish; said of a man: (A:) or he became affected with sluggishness and languor; (M;) as also ↓ تثاآءب: (M, A:) or he became affected with sluggishness and languor like the languor of drowsiness; as also ↓ تثاآءب and ↓ تثأّب; (K;) which last is approved by IDrd and Thábit Es-Sara- kustee, who disallow ↓ تثاآءب, though this is the form commonly known and approved, and is the most chaste form: (TA:) or he became affected with languor like the heaviness of drowsiness, in consequence of something that he had eaten or drunk, without becoming insensible; (T;) as also ↓ تثاآءب: (L:) or ↓ this last signifies he yawned, or opened his mouth, (Mgh, Msb,) by reason, (Mgh,) or on the occasion, (Msb,) of languor (Mgh, Msb,) like the heaviness of drowsiness; (Mgh;) or he yawned, or opened his mouth, and stretched himself, on being affected by sluggishness or drowsiness or anxiety; (MF, TA, on the authority of IDrst;) or he yawned, or opened his mouth, and emitted wind from his stomach, by reason of some affection thereof: (TA on the authority of EtTedmuree:) التَّثَاؤُبُ is from الثُّؤَبَاآءُ; (AZ, T, S, Mgh;) and is on the occasion of one's stretching himself, and being languid: (Lth, T:) one should not say تَثَاوَبَ; (AZ, T, S, O, Mgh;) [for] this is vulgar. (Msb.) Hence, أَحَدُكُمْ فَلْيُغَطِّ ↓ اـِذَا تَثَأَءَبَ فَاهُ [ When any one of you yawns, he should cover his mouth with the back of his left hand; for it is believed that the devil leaps into the uncovered yawning mouth]. (Mgh.)