とど

Etymology 2
From, that term referring the largest specimens of the species.

Noun

 * 1) the end, the limit

Verb

 * 1) to be at the furthest limit
 * 2) to just barely finish; to finish at the last moment

Adverb

 * 1)  as or while staggering, tottering
 * 1)  as or while staggering, tottering