into
preposition, before vowels /ˈɪntu/, strong form /ˈɪntuː//ˈɪntə/, before vowels /ˈɪntu/, strong form /ˈɪntuː/
For the special uses of into in phrasal verbs, look at the entries for the verbs. For example lay into somebody/something is in the phrasal verb section at lay.