A general term for ‘student’ of something or someone.
Being a deshi is not a casual situation but denotes a very serious dynamic between student and teacher and
generally means you already have a menkyo and exhibit a strong strong desire and potential to take the Sensei’s style to
the next level and/or generation.
Being a deshi implies that you are close to the Sensei and essentially assists him with all his activities.
In the case of rope that means do all the Sensei video shoots as an assistant, prepare and put away the ropes etc.
It would be unusual for a Sensei to have more than one or two deshi at the same time.
Deshi are usually expected to fly with their own wings after 5-7 years depending upon the discipline.
Normally taking a deshi only happens when you have become eminent yourself as a Sensei and are looking to retirement in the future.
You could say ‘nawa no deshi’ (student of rope) or ‘kinbaku no deshi’ (student of kinbaku), etc.
Similar with ‘Sensei’ you do not introduce yourself as ‘deshi’.
See also: Biginaa, Shirouto, Nawa Yaru Hito, Seito, Kohai, Senpai, Menkyo, Deshi.