It's a grammatical error in verb tense usage.
People often make this error due to phonetic confusion, as "used to" and "use to" sound almost identical in spoken language. Additionally, people might mistakenly omit the "d" while writing due to misunderstanding the correct form.
"Used to" is the correct form to indicate an action that occurred regularly in the past but no longer happens.
People often make this error because they confuse the verb ... Learn more →
People often confuse "advise" and "advice" because they sound similar ... Learn more →
People might drop the "e" mistakenly, as it sounds correct ... Learn more →
People make this error because "must of" is a phonetic ... Learn more →