きりOnly, Just, Since

As an adverbial particle, きり may convey that 'upon (A)', where (A) is usually a verb, that action was the 'first and last time'. This is frequently translated as 'only', 'just', or 'since'. きり comes from the う - Verb 切(き)る 'to cut'. きり is often used after the plain past form of verbs, with nouns, or with counters. Let's look at verbs first.

With verbs, きり is primarily used to show that (A) occurring was all that was required for (B). Usually, this results in some permanent consequence, or permanent change of opinion. In almost every situation, (A) is something that has only happened once, and きり can be interpreted as 'ever since'.

When it comes to the use of きり with nouns or counters, it will express that something is happening with (A) as the limit 'nothing more, nothing less'. In other words, (A) is all that will be included in some particular situation/action.

Caution

きり may also be seen as っきり or キリ. There is no specific change in nuance, but っきり is the most common casual form.