1to dry up; to become parched — an intransitive verb meaning moisture is lost and something becomes dry.
洗濯物が晴れた日に外でよく干った。
The laundry dried well outside on the sunny day.
田んぼの水が抜けて、土が干っていた。
The paddy field's water drained away and the soil was dry.
魚が風でよく干って保存できるようになった。
The fish dried well in the wind so they could be preserved.
2to ebb; to recede — used for water levels falling (somewhat literary).
満潮が過ぎて、浜辺の岩が干ってきた。
After high tide passed, the rocks on the shore began to be exposed.
潮が干ると歩いて小さな島まで渡れる場所ができる。
When the tide recedes, a place appears where you can walk across to a small island.