I am looking for the definition of "flick" (in Jive) by ISTD or WDSF.
Thanks a lot if anyone know.

As far as I know, this term usually refers to a little kick above the floor:

You lift the foot a little (starting from the knee) and then straighten the knee again in the air (as if you wanted to shake off a bug sitting on your toes... forgive me the description, but I hope it gets the idea across ;) )

Walter Laird mentions it in his book as "..a flick action from the knee, with the foot approx 15 cms off the floor..", which is then followed by a ball change.

Hope you find this helpful!

Greetings,
Simon