You're right Hgrove
Following taken from on-lone phronology course
Elision refers to when a sound or syllable is lost or omitted. It particularly affects: consonant clusters; weakly stressed syllables that are not especially missed; and words that end in an alveolar consonant and that are immediately followed by a word beginning with a consonant. The sounds that are elided are those sounds that are so weakly articulated that they no longer have any auditory significance.
Some elided syllables are represented in standard punctuation, for example, /I'm/ should be /I am/. In standard speech, the missing vowel is understood and so meaning does not suffer from this contraction.
Elision is one of the reasons for the great mismatches found in English between a word's spelling and its pronunciation. /wednesday/, for example, was originally a contraction of /Odin's day/ while today, Odin is barely discernable as the /d/ is no longer pronounced.
Elision is most commonly used in, but is not exclusive to, connected speech. The faster the speech, the more likely that sounds and syllables will be elided.