Let not the fire sink or slacken.
Mortimer.
5. To decrease in volume, as a river; to subside; to become diminished
in volume or in apparent height.
The Alps and Pyreneans sink before him.
Addison.
Syn. -- To fall; subside; drop; droop; lower; decline; decay; decrease;
lessen.
Sink, v. t. 1. To cause to sink; to put under water; to immerse or
submerge in a fluid; as, to sink a ship.
[The Athenians] fell upon the wings and sank a single ship.
Jowett (Thucyd.).
2. Figuratively: To cause to decline; to depress; to degrade; hence, to
ruin irretrievably; to destroy, as by drowping; as, to sink one's
reputation.