Refers to the act of sinking something or the state of being submerged. Often used in contexts like fishing or diving.
In fishing, you use a sinker to sink the rig deep.
Specifically a weight used to sink fishing lines or nets. Also used in other contexts where a heavy object is needed to submerge something.
This sinker is made of lead.
沈めの技術は潜水作業で重要だ。
The technique of submerging is important in diving work.
Attach weights to the net and sink it to the seabed.
Nominalized form of the verb 沈める (しずめる, 'to sink something'). The kanji 沈 means 'sink' or 'submerge'.