〜きり・〜っきり
only, just; since (and not again)
Noun / Number + きり · Verb た-form + きり
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きり has two uses.
After a noun or number, it means "only, just": 二人きりで話したい, "I want to talk, just the two of us"; 一度きりの人生, "you only live once". In speech it's often っきり: これっきり, "only this"; それっきり, "and that was that".
After a た-form, it means something happened and then nothing further did: 彼とは去年会ったきり、連絡していない, "I met him last year, and haven't been in touch since". 出かけたきり帰ってこない, "went out and never came back".
The second half is usually negative. The feeling is that a situation got stuck, or ended without the expected follow-up.
Examples
二人きりで話したい。
I want to talk, just the two of us.
彼とは去年会ったきり、連絡していない。
I met him last year, and I haven't been in touch since.
息子は朝出かけたきり、まだ帰ってこない。
My son went out this morning and still hasn't come back.
一度きりの人生だ。
You only live once.
お金はこれっきりしかない。
This is all the money I have.