1. with a click (of a button or switch)

adverb taking the 'to' particle onomatopoeic or mimetic word

2. with a snap, crisply

adverb taking the 'to' particle noun or participle which takes the aux. verb suru onomatopoeic or mimetic word

3. one (small protrusion, hole, etc.), single

noun or participle which takes the aux. verb suru adverb taking the 'to' particle onomatopoeic or mimetic word

4. shortly, briefly, small

adverb taking the 'to' particle onomatopoeic or mimetic word