Linked from
The 11 pages that link to Language attrition, each with the reason it gives.
BilingualismRelated: Unequal practice can change a bilingual person's proficiency over time.
Language learningCompared with: It describes declining language ability rather than its acquisition.
First languageRelated: A first language may weaken when another language dominates daily life.
Second languageRelated: A once-learned second language can weaken when it is used less often.