titch
A very small person; a small child.
I ain't afraid of a titch like you.
A small amount.
Is there any milk left? Just a titch.
Where it comes from
From the stage name Little Tich; see tich. Attested since the 1880s. Possibly also from, or influenced by, a word from Old English ticcen (“young goat”).
Adapted from the Wiktionary entry titch (CC BY-SA 4.0).