decline

v.下降，倾斜；衰败；拒绝 n.衰落，下降

decipher, decipherable, decision, decision-making, decisive, decisively, decisiveness, deck, deck-chair, deck-hand, declaim, declamation, declamatory, declaration, declare, declared, declassification, declassify, declension, declination, declining, declivity, declutch, decode, decoder, decoke, decolletage, decollete, decolonization, -isation, decolonize, decolonise, decompose, decomposition, decompress, decompression, decongestant, decontaminate, decontamination, decontrol, decor, decorate,