−さえ

1. 1 〔さらに〕
   • 雨さえ降ってきた
   • On top of that [everything], it began to rain.

1. 2 〔…ですら〕even
   • 彼さえ知らないのだからだれも知らないだろう
   • If even he doesn't know, then nobody does.
   • ABCさえ書けない
   • He can't even write the alphabet.／He cannot so much as write the alphabet.
   • 1滴の水さえない
   • There is not a drop of water (to be had [found]).
   • 彼は兄弟にさえ裏切られた
   • He was betrayed even by his own brothers.

1. 3 〔そのことだけで十分〕
   • もっと勉強しさえすれば試験に合格できたのに
   • If only you had studied harder, you could have passed the examination.
   • これさえあれば十分だ
   • This is all I need.

出典：プログレッシブ和英中辞典