by choice

自ら進んで、好き好んで

by choice の類語

voluntarily, intentionally, preferably, before, first, rather, sooner, rather than, by design, by vote, freely, independently, by election, deliberately, on purpose, purposely, sooner than, in preference, spontaneously, optionally, without coercion, gratuitously, advisedly, willfully, designedly, electively

by choice の反意語

accidentally, unintentionally, involuntarily

by choice の言い換えを探すには

by choice（自ら進んで）の類語・言い換え（パラフレーズ）を、日本語訳つきで関連度順に並べています。英作文の語彙を増やしたいとき、長文読解で本文と選択肢の言い換えを見抜きたいときに使えます。