1. allude to （～にそれとなく言及する、ほのめかす）
= He alluded to the problem in his speech.
2. drift off（眠りに落ちる）
= She had just drifted off when the phone rang.
3. factor in（～を計算に入れる）
= Real estate values have declined when inflation is factored in.
4. intervene in（介入する、仲裁する）
= The government should not intervene in a free market.
5. zero in on（的を絞る、狙いを定める）
= The company is zeroing in on the youth market.
6. fork out（渋々払う）
= He forked out $200 for a taxi.
7. mark up（値上げする）
= Imported wines were marked up about 10 percent.
8. pass on（～を伝える）
= I'll pass your message on to her.