noun
daimyo's temporary stay in Edo; residence in Edo under sankin-kōtai
Historical term referring to the system where daimyo and their retainers resided in Edo periodically as part of the sankin-kōtai (alternate attendance) system during the Edo period.
See also: 参勤交代
江戸詰めの期間中、大名は江戸城に参上した。
During their Edo stay, the daimyo presented themselves at Edo Castle.
参
Under the sankin-kōtai system, many retainers experienced temporary residence in Edo.
参勤交代 is the system of alternate attendance itself, while 江戸詰め refers specifically to the stay in Edo under that system.
Compound of 江戸 (Edo) + 詰め (づめ, 'stay, being stationed'). The reading づめ is a rendaku form of つめ.