Edward William Lane, An Arabic-English Lexicon, ث

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ثُؤَبَآءُ ذ , (T, S, M, K, &c.,) as also ثُؤْبَآء, accord. to Ibn-Mis-hal, but this is strange, (TA,) is a subst. derived from التَّثَاؤُبُ, like مُطُوَآءُ from التَّمَطِّى; (T;) or from ثَئِبَ; and means A state of relaxation and sluggishness: (A:) or sluggishness and languor (M, K) like the languor of drowsiness: (K:) or languor like the heaviness of drowsiness, in consequence of something that one has eaten or drunk, not attended by insensibility: (T, L:) or a yawning, or opening the mouth, by reason of languor like the heaviness of drowsiness: (Mgh:) or a yawning, or opening the mouth, and stretching oneself, on being affected by sluggishness or drowsiness or anxiety: (IDrst, MF, TA:) or a yawning, or opening the mouth, and emitting wind from the stomach, by reason of some affection thereof. (Et-Tedmuree, TA.) Hence the prov., أَعْدَى مِنَ الثُّؤَبَآءِ, (S, A, TA,) and [الثُّوَبَآءِ,] without ', as some say; (MF;) or the pronunciation without ' is vulgar, (IDrst, TA,) or erroneous; (TA;) [More catching than yawning;] for when a man yawns ( اذا تثاءب ) in the presence of others, they become affected as he is. (TA.)