tot

Etymology 1

Borrowed from Scots tot, a shortened form of totum (“small child; tot”), of uncertain origin. Compare totter, tottle. Compare also Old Norse tottr (“name of a dwarf”), Swedish tutte (“small child”), Danish tommeltot (“little child”).

noun

1. A small child.
   He learned to run when he was just a tot.
2. A measure of spirits, especially rum.
   Then I give them a tot of rum apiece, as they sit huddled in their blankets. 1897, Mary H. Kingsley, Travels in West Africa
   And tot of rum to send him warm to sleep. 1916, Siegfried Sassoon, The Working Party
3. Ellipsis of tater tot.
4. (Barbados) A small cup, usually made of tin.
5. (UK, dialect, obsolete) A foolish fellow.
   Whoe answeared like a toute, or a maddman, as he was, that he was for the Kinge. a. 1660, A Contemporary History Of Affairs In Ireland

Etymology 2

Clipping of total (“to sum”)

verb

1. To sum or total.
   There are, of course, many ways to proceed from here, the most likely being that you, as an experienced tradesman, would simply know what these amounts come to (in terms of groups of ten) and can tot them up in your head. 2017, Paul Lockhart, Arithmetic
2. (UK, historical) To mark (a debt) with the word tot (Latin for "so much"), indicating that it was good or collectible for the amount specified.
   a totted debt

noun

1. A total, an addition of a long column of figures.