Routledge Dictionary of Language and Linguistics
Glottal closure before (=preglottalization) or after (=postglottalization) a speech sound. Preglottalized consonants are closest to implosives, postglottalized are closest to ejectives. Preglottalized vowels can be found occasionally in English when, for example, a speaker attempts to avoid running words 
‘not at all’ (see Moulton 1962); postglottalized vowels are found in the Sino-Tibetan language of Tsaiwa-Jingpo. In preglottalized vowels, one also speaks of abrupt onset of voicing, e.g. in 
in Ger.
beachten ‘regard’ (in contrast to delayed onset of voicing, e.g. in Fr. ['ale:] aller ‘to go’). Some English dialects, most notably Cockney, substitute a glottal stop for intervocalic consonants, e.g. 
bottle.
References
Moulton, W.G. 1962. The sounds of English and German. Chicago, IL.
phonetics
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