When she first started working she was a real 'eager beaver'.
They're still 'beavering away at' the problem.
a 'beaver' dam [=a dam built by beavers]
(..) No. no. no. You're iust a young kid! What are you doing here? You ought to be out in a convertible... ...bird-dogging chicks and banging beaver. What are you doing here. tor Christ's sake? What's so tunny about that? Jesus. l mean. you guys do nothing but complain about how you can't... (..)1975 One Flew Over the Cuckoo's Nest
(..) l practically had to take to sewing my pants shut. But between you and me... ...she might have been . When you get that little red beaver... ...right there in tront ot you. l don't think it's crazy at all. And l don't think you do. either. l hear what you're saying. No man alive could resist that. (..)1975 One Flew Over the Cuckoo's Nest