[a lot] {n.}, {informal} A large number or amount; very many […]

[as much as] {adv. phr.} 1. or [much as] Even though; […]

[at first blush] {adv. phr.} When first seen; without careful study. […]

[at length] {adv. phr.} 1. In detail; fully. * /You must […]

[at sea] (2) {adj. phr.} Not knowing what to do; bewildered; […]

[bird watcher] {n.} A person whose hobby is to study birds […]

[bone up] {v.}, {informal} To fill with information; try to learn […]

[branch off] {v.} To go from something big or important to […]

[brown study] {n. phr.} A time of deep thought about something; […]

[burn the midnight oil] {v. phr.} To study late at night. […]