kaku
1.

To use one's fingers, nails, or a sharp object to touch or rub the surface of the skin, often to alleviate irritation or discomfort.

2.

To remove or disturb a surface layer by scraping, such as with a tool or one’s fingernails, which can also result in creating marks or damage.

3.

To engage in a repetitive motion that involves friction against a surface, typically for relief or to stimulate sensation.

4.

To create a sound or effect by briskly moving or scraping an instrument against a surface, often used in a musical context.

Example:

蚊に刺されたところをかいちゃだめだよ。はれちゃうから。

あが足掻agaku
1.

To struggle or make frantic movements in an effort to escape or overcome a difficult situation.

2.

To flail or writhe in a way that expresses desperation or an attempt to gain control.

3.

To strive or exert oneself in a challenging context, often conveying a sense of futility or resistance against an overwhelming force.

Example:

窮地から足掻き出る。

hikakuhiっかくkkaku
1.

To make a mark or damage a surface by dragging a sharp object or nail across it.

2.

To use one's fingernails or a similar tool to disrupt the surface of a material, often resulting in a painful sensation on the skin.

3.

To move one's hand or paw in a quick, scrappy motion as a means of expression, defense, or communication, often to indicate irritation or anger.

4.

To remove something from a surface by scraping, typically involving a level of force that leaves behind a trace or residue.

Example:

虫に刺された跡を引っかかないようにした方がいいよ。