rely B1

/ɹɪˈlaɪ/ To trust; to have confidence in; to depend.

ally B2

/ˈæl.aɪ/ an associate who provides cooperation or assistance

obligation B2

/ˌɑ.blɪˈɡeɪ.ʃn̩/ the state of being obligated to do or pay something

liable C1

/ˈlaɪ̯əbəl/ held legally responsible

liaison C1

/liˈeɪˌzɑn/ a channel for communication between groups

oblige C1

/əˈblaɪd͡ʒ/ provide a service or favor for someone