to withhold or deny consent to do, enter into or upon, etc.; refuse: He declined to say more about it.
to express inability or reluctance to accept; refuse with courtesy: to decline an invitation; to decline an offer.
to cause to slope or incline downward.
Grammar. to inflect (a noun, pronoun, or adjective), as Latin puella, declined puella, puellae, puellae, puellam, puella in the five cases of the singular. to recite or display all or some subset of the inflected forms of a noun, pronoun, or adjective in a fixed order.
to express courteous refusal; refuse: We sent him an invitation but he declined.