verb
-clines; -clined; -clining
[no obj] :to become lower in amount or less in number
[no obj] :to become worse in condition or quality
somewhat formal
[+ obj] :to say that you will not or cannot do something
usually followed by to + verb
to say no to something in a polite way [+ obj]
[+ obj] grammar :to list the different forms of (a noun, pronoun, or adjective)
noun
plural -clines
the process of becoming worse in condition or quality [noncount]
usually singular
a change to a lower number or amount [count]
on the decline
becoming worse in condition or less in size, amount, number, etc. :declining