ichidan verb, intransitive verb
Intransitive verb meaning to become covered with red rust. Often used in the past tense form 赤錆びた to describe a rusted state.
古い自転車がすっかり赤錆びてしまった。
The old bicycle has completely rusted.
赤錆びた釘は危ない
Rusted nails are dangerous, so let's pull them out.