i Register
In some senses, usta is marked as informal. Watch for register when choosing this word.
contraction
used to: accustomed to
That safe's one o' th' kind I'm usta.
It needs a lot of work, and it's a tad smaller than I'm usta, but you know what they say...
used to: formerly did
We usta have a rule that if a trusty shot an escaping convict, then the trusty would go free.
use to
name
Initialism of United States Tennis Association (“the national governing body for tennis in the United States”).