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Webster 1913 Edition
Stammer
Stam′mer
(stăm′mẽr)
, Verb.
 I.
 [
imp. & p. p. 
Stammered 
(-mẽrd)
; p. pr. & vb. n. 
Stammering
.] [OE. 
stameren
, fr. AS. stamur
, stamer
, stammering; akin to D. & LG. stameren 
to stammer, G. stammeln
, OHG. stammalōn
, stammēn
, Dan. stamme
, Sw. stamma
, Icel. stama
, stamma
, OHG. & Dan. stam 
stammering, Icel. stamr
, Goth. stamms
, and to G. stemmen 
to bear against, stumm 
dumb, D. stom
. Cf. Stem 
to resist, Stumble
.] To make involuntary stops in uttering syllables or words; to hesitate or falter in speaking; to speak with stops and difficulty; to stutter. 
I would thou couldst 
 stammer
, that thou mightest pour this concealed man out of thy mouth, as wine comes out of a narrow-mouthed bottle, either too much at once, or none at all. Shakespeare
Stam′mer
(stăm′mẽr)
, Verb.
 T.
 To utter or pronounce with hesitation or imperfectly; – sometimes with out. 
 Stam′mer
,Noun.
 Defective utterance, or involuntary interruption of utterance; a stutter. 
Webster 1828 Edition
Stammer
STAMMER
,Verb.
I.
 STAMMER
,Verb.
T.