Consonant cluster reduction

From Teflpedia

Consonant cluster reduction, often cluster reduction is a phonological feature in which the sounds of consonant clusters are reduced.

For example, in English, the word "fifths" is pronounced /ˈfɪfθs/ in careful speech, but this is likely to be reduced to /ˈfɪθs/ in rapid speech.

Historical consonant reduction may leave silent letters present in spelling, e.g. "lamb", etc.