rely B1

/ɹɪˈlaɪ/ To depend on or trust someone or something to do what you need.

ally B2

/ˈæl.aɪ/ A country or group that agrees to support another, especially in war or politics.

obligation B2

/ˌɑ.blɪˈɡeɪ.ʃn̩/ Something you must do because of a law, promise, or moral duty.

liable C1

/ˈlaɪ̯əbəl/ Likely to do or experience something, usually something bad.

liaison C1

/liˈeɪˌzɑn/ A person who passes information and helps two groups work together.

oblige C1

/əˈblaɪd͡ʒ/ To force or require someone to do something, by law, rules, or circumstances.