Has two core meanings: (1) 'only / just' limiting to a single amount, similar to だけ, and (2) after a past-tense verb, 'since X, nothing changed / it never happened again.' The second, more distinctly N3 use expresses that an expected follow-up never came.
[Noun] + きり / [Verb た-form] + きり
二人きりで話したい。
Futari kiri de hanashitai.
I want to talk just the two of us.
Noun 二人 + きり = 'only the two', limiting sense
彼は出かけたきり、帰ってこない。
Kare wa dekaketa kiri, kaette konai.
He went out and hasn't come back since.
出かけた (past) + きり = 'since going out', with no change after
祖母とは十年前に会ったきりだ。
Sobo to wa juunen mae ni atta kiri da.
The last time I saw my grandmother was ten years ago.
会った (past) + きりだ = met once and never again since
• Two uses: 'only/just' (like だけ) and 'since X, no change' after た-form. • The 'no change' sense implies an expected next step never happened. • っきり is a common emphatic spoken variant.
The JLPT rarely asks whether you recognise a pattern — it asks which of several similar patterns fits. These are the ones ~きり is tested against.
In the limiting sense both mean 'only', but きり adds a finality/exclusivity nuance and, unlike だけ, also has the special 'since then, nothing changed' meaning after a past verb.
た-form + きり stresses that an expected follow-up never occurred ('went out and never returned'); た-form + まま stresses an unchanged state persisting ('left the window open').
Study Japanese grammar on LenGaki

Get the Android app
The app adds offline study, home-screen widgets, stroke-order tracing, speaking practice with pronunciation scoring, and an AI tutor that answers questions in context — none of which fits in a browser tab.