汰 is built from the 氵 (water (left)) and 太 components.
It reads タ like 太, as do 駄 — learn 太 once and the family's reading comes with it.
A common word using 汰 is 無沙汰 (ぶさた), meaning “neglecting to stay in contact”.
Kanji that look similar include 決, 汽, 沈, and 沖.
