knee-deep in

*knee-deep in something

 
1. Fig. heavily involved in something. (*Typically: be ~; get ~.) Right now, we are knee-deep in trouble.
2. Fig. having plenty of something. (*Typically: be ~; Stand ~.) We are knee-deep in orders and loving it.
References in classic literature ?
I remained standing knee-deep in the heather, staring at the mound that hid them.
Every freak of prodigality was indulged to its fullest extent, and in a little while most of the trappers, having squandered away all their wages, and perhaps run knee-deep in debt, were ready for another hard campaign in the wilderness.
But where Silver stood with his lieutenant, all was still in shadow, and they waded knee-deep in a low white vapour that had crawled during the night out of the morass.
On such an afternoon some score of members of the High Court of Chancery bar ought to be--as here they are--mistily engaged in one of the ten thousand stages of an endless cause, tripping one another up on slippery precedents, groping knee-deep in technicalities, running their goat-hair and horsehair warded heads against walls of words and making a pretence of equity with serious faces, as players might.
I was the only inside passenger, jolting away knee-deep in straw, when I came to myself.
Soldiers floundering knee-deep in mud pushed the guns and wagons themselves.
To move down so cunningly that never a leaf stirred; to wade knee-deep in the roaring shallows that drown all noise from behind; to drink, looking backward over one shoulder, every muscle ready for the first desperate bound of keen terror; to roll on the sandy margin, and return, wet-muzzled and well plumped out, to the admiring herd, was a thing that all tall-antlered young bucks took a delight in, precisely because they knew that at any moment Bagheera or Shere Khan might leap upon them and bear them down.
All of a sudden I'd be traveling down a country road, and everything clean and quiet, no dust, no dirt; just streams ripplin' down sweet meadows, and lambs playing, breezes blowing the breath of flowers, and soft sunshine over everything; and lovely cows lazying knee-deep in quiet pools, and young girls bathing in a curve of stream all white and slim and natural--and I'd know I was in Arcady.
In a moment I was knee-deep in rotting vegetation, and the awful thing behind me was gaining rapidly as I floundered and fell in my efforts to extricate myself.
Instead of stalking down the rugged path we ascended, we chose one which was bedded knee-deep in loose ashes, and ploughed our way with prodigious strides that would almost have shamed the performance of him of the seven-league boots.
I was still on my legs, if they were knee-deep in mud.
Now, if you'd only an estate and a mansion, and a park, and a title, how you could play the exclusive, maintain the rights of your class, train your tenantry in habits of respect to the peerage, oppose at every step the advancing power of the people, support your rotten order, and be ready for its sake to wade knee-deep in churls' blood; as it is, you've no power; you can do nothing; you're wrecked and stranded on the shores of commerce; forced into collision with practical men, with whom you cannot cope, for YOU'LL NEVER BE A TRADESMAN.
The very cattle looked more tranquil than ours, as they stood knee-deep in clover, and the hens had a contented cluck, as if they never got nervous like Yankee biddies.
Knee-deep in the water, with drooping head and half-shut eyes, drowsed a red-coated, many-antlered buck.
The sun was lying low in the west and shooting its level rays across the long sweep of rich green country, glinting on the white-fleeced sheep and throwing long shadows from the red kine who waded knee-deep in the juicy clover.