1. tamper with（～をいじくる）
= I could see immediately that the lock had been tampered with.
2. gloss over（～をごまかす、はぐらかす）
= She tried to gloss over his mistake.
3. crop up（発生する、生じる）
= A problem cropped up during surgery.
4. nod off（居眠りする）
= I found myself nodding off during the meeting.
5. descend on（～に押し掛ける、押し寄せる）
= Hudreds of demonstrators descended on the US embassy.
6. sink in（理解される）
（d the e-mail several times before it sank in.
7. hold down（続ける、価格などを抑える）
= He holds down two jobs to provide for his family.
8. run up（ためる、増やす）
= She has run up debts of $20,000.