At the elbow at English => English (Websters 1913) Of Explained:

Elbow \El"bow\, n. [AS. elboga, elnboga (akin to D. elleboga,
OHG. elinbogo, G. ellbogen, ellenbogen, Icel. ?lnbogi; prop.;
arm-bend); eln ell (orig., forearm) + boga a bending. See 1st
{Ell}, and 4th {Bow}.]
1. The joint or bend of the arm; the outer curve in the
middle of the arm when bent.

Her arms to the elbows naked. --R. of
Gloucester.

2. Any turn or bend like that of the elbow, in a wall,
building, and the like; a sudden turn in a line of coast
or course of a river; also, an angular or jointed part of
any structure, as the raised arm of a chair or sofa, or a
short pipe fitting, turning at an angle or bent.

3. (Arch.) A sharp angle in any surface of wainscoting or
other woodwork; the upright sides which flank any paneled
work, as the sides of windows, where the jamb makes an
elbow with the window back. --Gwilt.

Note: Elbow is used adjectively or as part of a compound, to
denote something shaped like, or acting like, an elbow;
as, elbow joint; elbow tongs or elbow-tongs; elbowroom,
elbow-room, or elbow room.

{At the elbow}, very near; at hand.

{Elbow grease}, energetic application of force in manual
labor. [Low]

{Elbow in the hawse} (Naut.), the twisting together of two
cables by which a vessel rides at anchor, caused by
swinging completely round once. --Totten.

{Elbow scissors} (Surg.), scissors bent in the blade or shank
for convenience in cutting. --Knight.

{Out at elbow}, with coat worn through at the elbows; shabby;
in needy circumstances.

Related words:

at table  at that  at that place  at the best  at the best of times  At the bottom  at the coal face  at the corner  At the countretaille  at the double  At the downlying  at the drop of a hat  at the eleventh hour  at the end of one's rope  at the end of one's tether  at the end of one’s tether  at the end of the day  at the end of the road  at the end of your rope  at the expense of  at the feet of  At the first  At the first blush  at the foot of  At the fore  At the hand of  at the hands of  at the helm  at the high port  At the last  At the last gasp  at the last minute  at the latest  at the least  At the long run  at the mercy of  at the moment  at the most  at the ready  at the receiving end  at the same time  at the start  at the top of one's lungs  at the top of one's voice  at the wheel  at the worst  at this moment  at this moment in time  at this point in time  At times  át tudod ugrani?