Refers to a mix of things, often in a casual or vague way. Similar to あれこれ, but これかれ is less common.
I'm busy with this and that, so I can't really take a break.
Various things are scattered on the desk.
Anyone can participate, without distinction between this person and that person.
I went around talking to this person and that person (everyone).
Rare kanji form; the kana spelling is strongly preferred.
Rare kanji form with okurigana; the kana spelling is strongly preferred.
Rarely used kanji form; the kana spelling is strongly preferred.
Compound of これ (this) and かれ (that). The kanji forms are rare and mostly historical.