It's an irregular verb.
what is regular and irregular motion in physics
'to hit' is an irregular verbThe past participle of hit is hit.
regular
Anomalous
"He hit you" is the past tense form. Hit is an irregular verb and the past tense form is also "hit".
Examples of irregular verbs that have the same present and past tense forms are "hit," "cut," and "wet."
periodic, alternate, irregular, seasonal, recurrent
Irregular can be used as an adjective, meaning not regular in shape, arrangement, or occurrence; contrary to a rule, standard, or convention; not belonging to regular army units; Grammar (of a word) having inflections that do not conform to the usual rules.Irregular can be used as a noun meaning a member of an irregular military force.
A rounded mass or irregular shape; a little knot or lump.
Sawed (meaning to cut something with a saw) is regular.
One prefix for "regular" is "ir-," as in "irregular." This prefix changes the meaning of the word to indicate that something is not following a regular pattern or norm.