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a short while ago; a moment ago; just now; some time ago
「先」 has other readings with different meanings.
さっき電話があったよ。
You got a phone call a while ago.
さっき言ったことをもう忘れたの。
Did you already forget what I said just now?
さっきまで晴れていたのに急に雨が降り出した。
It was sunny just a moment ago, but it suddenly started raining.