to
preposition
[ tə ]
• expressing motion in the direction of (a particular location).
• "walking down to the shops"
• approaching or reaching (a particular condition).
• "Christopher's expression changed from amazement to joy"
• identifying the person or thing affected by or receiving something.
• "you were terribly unkind to her"
• identifying a particular relationship between one person and another.
• "he is married to his cousin Emma"
• indicating that two things are attached or linked.
• "he had left his dog tied to a drainpipe"
• concerning or likely to concern (something).
• "a threat to world peace"
• used to introduce the second element in a comparison.
• "the club's nothing to what it once was"
• placed before a debit entry in accounting.
to
infinitive marker
• used with the base form of a verb to indicate that the verb is in the infinitive.
• used without a verb following when the missing verb is clearly understood.
• "he asked her to come but she said she didn't want to"
to
adverb
• so as to be closed or nearly closed.
• "he pulled the door to behind him"
Origin:
Old English tō (adverb and preposition), of West Germanic origin; related to Dutch toe and German zu .