1 refuse, turn down, deny, reject, demur, forgo, veto, avoid, abstain from:
She declined help with the packages. Roger was offered a professorship at the university but he declined.
2 diminish, lessen, decrease, wane, flag, go down, fall or taper off, subside, ebb, abate, dwindle, shrink, fade, Colloq peter out, run out of steam, US run out of gas:
Demand for hula hoops declined.
3 slope or slant (downwards), descend, drop or fall off, dip, sink:
The meadow declines towards the river.
4 deteriorate, degenerate, worsen, fail:
My health has declined over the last year.
5 go or drop down, settle, dip, sink, set:
The sun was declining as I went home.
6 diminution, decrease, lessening, ebb, downturn, fall-off, reduction, abatement, slump, descent:
There has been a steady decline in the value of the pound.
7 degeneration, deterioration, loss, diminution, weakening, debility, weakness, worsening, decay, failing:
We noted a decline in the physical condition of those living nearby.
8 declivity, (downward) slope or slant, descent, downgrade, incline:
The path led down a steep decline towards the pond.