Definitions

1. verb

to touch lightly in a playful or teasing way, causing a person or animal to laugh or feel amused

“The children started to tickle each other during recess.”

2. noun

a light, playful touch, often causing laughter or amusement

“The tickle on her arm was from a fly buzzing nearby.”

3. verb

to cause a device or system to malfunction or become unstable, often due to a minor problem

“The small glitch in the software started to tickle the system, causing it to crash.”