1. own up to（～を白状する）
= He finally owned up to stealing the money.
2. interefere with（～に支障を来す、妨害する）
= She tries not to let work interfere with her personal life.
3. head off（～を阻止する）
= The airline has headed off a strike by flight attendants.
4. make off with（～を持ち去る、持ち逃げする、盗む）
= The robber made off with about $2.000 from a cash register.
5. abide by（規則などに従う）
= All students must abide by school rules.
6. butter up（～にごまをする）
= It's no use buttering me up.
7. delve into（～を徹底的に調べる、詮索する）
= Police delved into the student's background.
8. buckle down to（本腰を入れる、本気で取り掛かる）
= It's time to buckle down to work.