Dieing, dying and dyeing are three homophones, meaning they sound almost identical. Of course, they also look very similar, so it’s common to see them mixed up in speech and writing.
A die or die-cast, among other things, is a tool to shape metals. It also has a verb form, to die, meaning the action of cutting those metals with the die. Therefore, the process of dieing is the action in the present tense of shaping metals with a die. Because of its narrow meaning specific to industry, it’s not a word you will come across too often.
Note: The majority of writers will go through their career without coming across the word dieing. In fact, Microsoft Word picks it up as misspelled, such is its rare usage. The important thing to note is that it has no relation to dying, and that using it when writing about the action of ceasing to live is incorrect.
Dying is the present participle of the verb to die, i.e. it is the present tense action of ceasing to live.
Dying can also be used as an adjective, to describe the point of death.
In addition, we can use dying in more idiomatic, non-literal, ways:
Dyeing is the present participle of the verb to dye, i.e. the present tense action of using dye to change the color of something.
The first thing to remember is that dieing is very unlikely to be used in your vocabulary, so forget it unless you intend to have a specialist career in metal-working. As for dying and dyeing, grammar sites will recommend that you focus on the extra e in dyeing, associating it with words like material and clothes, which also contain the letter “E”. Another way to remember that dye is related to coloring something is that the “YE” in dye is the same “YE” in the word yellow, and many people dye their hair yellow (blonde).
While it can be confusing since die, as in death, has an irregular present participle, dying. You should also try to remember that when we cease to live, we do not dye – we die, and both live and die contain an “I”. This can help you remember that dyeing is incorrect when speaking of death.