In spoken English and informal written English, till is often used instead of until.
I hadn't left home till I was nineteen.
我直到19岁才离开家门。
tills
In a shop or other place of business, a till is a counter or cash register where money is kept, and where customers pay for what they have bought.
In spoken English and informal written English, till is often used instead of until.
They had to wait till Monday to phone the bank.
他们不得不等到星期一才能给银行打电话。