sinking noun. ['sɪŋkɪŋ] LME.
[from SINK verb + -ING¹.]
1. The action of SINK verb; an instance of this. LME.

2. A depression, a recess, a worked hollow. E18.

3. A dull spot on the surface of an oil-painting caused by the absorption of the pigments by the ground. E20.

Comb.:
sinking feeling a bodily sensation caused by hunger or apprehension; sinking fund a fund formed by periodically setting aside money to accumulate at interest, for the gradual repayment of a debt.

[TahlilGaran] English Dictionary ▲

sinking ppl adjective. ['sɪŋkɪŋ] M16.
[from SINK verb + -ING².]
That sinks; (of ground) soft, yielding (rare).
sinking sand rare a quicksand.

[TahlilGaran] English Dictionary ▲