What does "strikethrough" mean?

An horizontal line overlaid on other characters.

What is a synonym for "strikethrough"?

Common synonyms include: crossed out mark.

In HTML, wrapping text with the code and produces a strikethrough.

Pronounced //ˈstɹaɪk.θɹu//.

/ˈstɹaɪk.θɹu/ noun, verb

noun, verb ·Rare ·Advanced level

Noun

1
An horizontal line overlaid on other characters. countable, uncountable
"In HTML, wrapping text with the code <del> and </del> produces a strikethrough."
2
A horizontal or oblique line overlaid on individual characters. countable, uncountable
"(oblique)"

Verb

1
Alternative form of strike through. alt-of, alternative, no-present-participle, nonstandard
"2001, Rachel Webster, XHTML Simplified, A.D.R. (London) Limited, →ISBN, page 113, The next requirement is to strikethrough, “Yoga is just massage. Inline style element <strike> carries out this task easily. It strikes through text."

"In HTML, wrapping text with the code <del> and </del> produces a strikethrough."

Deverbal from strike through; the verb, in at least some cases, is a back-formation from the noun, despite being redundant to strike through.