Declined is a past tense and past participle of a word "Decline."
Decline- 1. (Typically of something regarded as good) become smaller, fewer, or less; decrease.
2. Diminish in strength or quality; deteriorate.
3. Politely refuse (an invitation or offer).
4. (Especially of the sun) move downwards.
5. (In the grammar of Latin, Greek, and certain other languages) state the forms of (a noun, pronoun, or adjective) corresponding to case, number, and gender.
Handicrafts declined in importance.