Quick Definition
καθεύδω v. I sleep, am sleeping
Strong's Definition
from 2596 and heudo (to sleep); to lie down to rest, i.e. (by implication) to fall asleep (literally or figuratively)
KJV Usage: (be a-)sleep
UBS Dictionary of the Greek New Testament
verb | εὔδω (sleep)
23.66 · Physiological Processes and States · Sleep, Waking
to sleep, to be asleep, sleep the state of being asleep In some languages sleep is expressed by an idiom, for example, ‘his soul had wandered away’ or ‘his eyes had disappeared.’ Though an expression such as ‘his soul had wandered away’ might appear in some languages to have misleading theological implications, it really means only ‘to sleep.’
MAT 8:24 · MAT 9:24 · MAT 13:25 · MAT 25:5 · MAT 26:40 · MAT 26:43 · MAT 26:45 · MRK 4:27 · MRK 4:38 · MRK 5:39 · MRK 13:36 · MRK 14:37 · MRK 14:37 · MRK 14:40 · MRK 14:41 · LUK 8:52 · LUK 22:46 · 1TH 5:6 · 1TH 5:7 · 1TH 5:7 · 1TH 5:10
23.104 · Physiological Processes and States · Live, Die
to be dead, to have died (figurative extension of meaning of καθεύδω[a] ‘to sleep,’ 23.66) to sleep, as a euphemistic expression for the state of being dead Some translators have attempted to preserve the figure of speech in καθεύδω[b] and κοιμάομαι[b] by translating to sleep rather than to have died or to be dead. Such a practice, however, has resulted in misunderstanding in a number of instances and has sometimes led to the doctrine of so-called soul-sleep.
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
καθ-εύδω ; impf. 3 pers. plur. ἐκάθευδον ; fr. Hom. down; Sept. mostly for 13¥ ; 1. to fall asieep, to drop off to sleep: Mt. xxv. 5. 2. to sleep ; a. prop.: Mt. viii. 24 ; ix. 24 [on this and its paral. ef. B. D. Am. ed. p. 1198*]; xiii. 25; xxvi.40,43,45; Mk. iv. 27, 38; v.39; xiii. 86; xiv. 37, 40sq.; Lk. viii.52; xxii. 46; 1 Th. v. Zs b. euphemistically, to be dead: 1 Th.v.10; (Ps. Ixxxvii. (Ixxxviii.) 6; Dan. xii. 2). c. metaph. to yield to sloth and sin, and be indifferent to one’s salvation: Eph. v. 14; 1 ΤῊ. ν. 6.
Mounce Concise Greek Dictionary
καθεύδω katheudō 22x
to sleep, be fast asleep, Mt. 8:24; 9:24; met. to sleep in spiritual sloth, Eph. 5:14; 1 Thess. 5:6; to sleep the sleep of death, to die, 1 Thess. 5:10
Abbott-Smith Greek Lexicon
καθεύδω,
[in LXX chiefly for שׁכב, Ge 28:13, Ps 87 (88):5, al.; also for יָשֵׁן, Ca 5:2, Da LXX TH 12:2, al.; for ישׁב, I Ki 19:9;]
to sleep: Mt 8:24 9:24 13:25 25:5 26:40, 43, 45, Mk 4:27, 38 5:39 14:37, 40, 41, Lk 8:52 22:46, I Th 5:7. Metaph., of death (as Ps 87 (88):5, Da LXX TH 12:2): I Th 5:10 (cf. Mt 9:24, Mk 5:39, Lk 8:52, and v. Swete, Mk 5:39);
of moral and spiritual insensibility: Mk 13:36, Eph 5:14, I Th 5:6.†
SYN.: κοιμάω.
Moulton & Milligan — Vocabulary of the Greek NT
καθεύδω. BGU IV. 114157 (B.c. 14) οὐδὲ γὰρ καθεύδωι ἔσωι ἵνα εἰδῶι, PSI 1. 9417 (ii/A.p.) καθεύδει τῇ νυκτί. In the rules regulating visitors to a sacred shrine, Sy// 589** (iv/B.C.), it is provided—ey δὲ tot κοιμητηρίοι καθεύδειν χωρὶς μὲν Tos ἄνδρας, χωρὶς δὲ τὰς γυναῖκας, The compound ἐγκαθεύδω occurs several times in the same document. Epict. ii. 20. 10 βαλὼν κάθευδε καὶ τὰ τοῦ σκώληκος ποίει, ‘lie down and sleep and play the part of the worm.” On the irregular construction in Mk 4?’ see Pro/eg. p. 185 f.
Liddell-Scott-Jones — Greek-English Lexicon
καθεύδω (katheudō) — to sleep. καθεύδω, so also in Ionic dialect, [Refs 5th c.BC+]imperfect καθεῦδον [Refs 8th c.BC+]; ἐκάθευδον [Refs 5th c.BC+]: future καθευδήσω [Refs 5th c.BC+]aorist ἐκαθεύδησα (not in Attic dialect), [Refs 2nd c.AD+]; infinitive καθευδῆσαι [Refs]:— lie down to sleep, sleep, [Refs 8th c.BC+]; opposed to ἀγρυπνέω, ἐγρήγορα, [Refs 6th c.BC+]; νυκτὸς κ. to sleep by night, [Refs 5th c.BC+]; κ. τὰς νύκτας to sleep all one's nights, [Refs 3rd c.BC+]; μαλακῶς, σκληρῶς κ., [Refs 4th c.BC+]; of male and female, ἵνα τώ γε καθεύδετον ἐν φιλότητι [Refs 8th c.BC+]: generally, pass the night, τὴν βουλὴν εἰς ἀκρόπολιν ἰέναι κἀκεῖ κ. [Refs 5th c.BC+]; κ. ἐπὶ ξύλου roost, of a fowl, [Refs 5th c.BC+]; ἐκ τοῦ καθεύδοντος from a sleeping state, [Refs 5th c.BC+]
II. metaphorically, lie asleep, lie idle, Χερί [Refs 5th c.BC+]; κ. τὸν βίον to be asleep all one's life, sleep away one's life, [Refs 5th c.BC+]; opposed to ἐνεργεῖν, [Refs 4th c.BC+]; opposed to προσέχειν τοῖς πράγμασι, [Refs 1st c.AD+]
II.2. of things, lie still, be at rest, ἐλπίδες οὔπω κ. [Refs 5th c.BC+]
II.3. of the sleep of death, καθεύδοντες ἐν τάφῳ [LXX+NT]