ὑπο-στολή, -ῆς, ἡ (< ὑποστέλλω), __1. a letting down, lowering (Plut.). __2. a shrinking back (Hesych.): οὐκ ἐσμὲν ὑποστολῆς (on the genitive, see Bl., § 35, 2), Heb.10:39.† (AS)
Thayer:
1) the timidity of one stealthily retreating
ὑποστολή
hupostolē
hoop-os-tol-ay'
From G5288; shrinkage (timidity), that is, (by implication) apostasy
ὑποστέλλω
hupostellō
hoop-os-tel'-lo
From G5259 and G4724; to withholdunder (outofsight), that is, (reflexively) to cower or shrink, (figuratively) to conceal (reserve)