used to

/ (juːst) /

adjective

made familiar with; accustomed toI am used to hitchhiking

verb (tr)

(takes an infinitive or implied infinitive) used as an auxiliary to express habitual or accustomed actions, states, etc, taking place in the past but not continuing into the presentI don't drink these days, but I used to; I used to fish here every day

usage for used to

The most common negative form of used to is didn't used to (or didn't use to), but in formal contexts used not to is preferred
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Idioms and Phrases with used to

used to

1

Accustomed or habituated to. This expression is often put as be or get used to, as in I'm not used to driving a manual-shift car, or She can't get used to calling him Dad. [Early 1500s]

2

Formerly. This sense is used with a following verb to indicate a past state, as in I used to ride my bicycle to the post office, or This used to be the best restaurant in town. [Late 1800s]

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.