no more than that; with that; on that note; altogether
Stronger version of それきり. Used to emphasize that something ended completely or that nothing more happened beyond that point. Often implies finality or a clean break.
See also: それきり
He said nothing more after that.
あの日を最後に、彼女とはそれっきり会っていない。
I haven't seen her since that day; that was the last time.
since then; ending there
Used to indicate that something stopped or ended at that point, and nothing further occurred. Similar to sense 1, but often focuses on the temporal aspect of 'since then'.
彼は一度手紙をくれたが、それっきり連絡がない。
He sent me a letter once, but I haven't heard from him since.
Derived from それ (that) + きり (only, limit), with a geminated consonant for emphasis. The exact historical development is uncertain, but it is a natural emphatic variant of それきり.