noun
special coaching stock awarded to retired grand champion
Sumo term: a retired yokozuna may be granted the right to use a special elder name and coaching stock for one generation only, without the usual requirement to acquire it from an existing stablemaster.
横綱が引退後、一代年寄を襲名した。
After retiring, the grand champion assumed the special one-generation elder name.
年寄 is the general term for a sumo elder or stablemaster. 一代年寄 is a special status granted only to retired yokozuna, allowing them to use a unique elder name for one generation.
Compound of 一代 (one generation) and 年寄 (sumo elder). The term refers to a special privilege in sumo where a retired yokozuna may hold an elder name for his lifetime only, without passing it on.